As long as *potential* dumpfiles are included you should be ok, eg:
C:\Users\hamcdc>expdp userid=mcdonac dumpfile=dp%U directory=temp parallel=2
Export: Release 12.2.0.1.0 - Production on Thu Nov 23 08:53:31 2017
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
Password:
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Starting "MCDONAC"."SYS_EXPORT_SCHEMA_01": userid=mcdonac/******** dumpfile=dp%U directory=temp parallel=2
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/PACKAGE/PACKAGE_BODY
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/FUNCTIONAL_INDEX/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
...
...
and then for the import, I never specified the full set of files - just the same wildcard:
C:\Users\comcdona>impdp directory=TEMP dumpfile=dp%U.dmp userid=mcdonac@pdb122a
Import: Release 12.2.0.1.0 - Production on Thu Nov 23 08:57:54 2017
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
Password:
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Master table "MCDONAC"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "MCDONAC"."SYS_IMPORT_FULL_01": directory=TEMP dumpfile=dp%U.dmp userid=mcdonac/********@pdb122a
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/DB_LINK
Processing object type SCHEMA_EXPORT/TYPE/TYPE_SPEC
Processing object type SCHEMA_EXPORT/SEQUENCE/SEQUENCE
Processing object type SCHEMA_EXPORT/CLUSTER/CLUSTER
Processing object type SCHEMA_EXPORT/CLUSTER/INDEX
...
...
But obviously
"Because every backup has same name convention like -test05.dmp test06.dmp ...are also there."
is not a great option - choose names that make it easy for future reference, eg the date in the filename etc.