Perhaps you should try some spelling variations:
luan thanh » quan thanh, xuan thanh, quang thanh
hieu tinh » chieu tinh, lieu tinh, kieu tinh
luan dong » luan cong, quan dong, luan nong
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - anh tang ((luan dong) or (luan thanh)) cong tac ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - anh tang ((luan dong) OR (luan thanh)) cong tac ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - anh tang ((luan dong) or (luan thanh)) cong tac ((toan cao) or (toan tap))*.