Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
chinh vat » chinh va, chinh dat, chinh viet
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
vat dung » van dung, va dung, viet dung
cong san » cong tac
san van » tan van, luan van, tran van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu quan - hanh chinh vat dung cong san van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu quan - hanh chinh vat dung cong san van ban*.