Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung quan » truong quan, trong quan, trung tuan
hieu quan » hieu qua, lieu quan, thien quan
quan hang » quan hoang, quan lang, quan hanh
hang cong » dang cong, hang nong, bang cong
hanh cham » thanh pham, hanh lam, hanh nam
nhanh bac » nhanh ha, nhanh va
doc hieu » toc thieu, hoc thieu, hoc hien
cong ban » cong bang, cong san, cong tan

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 quan - thanh trung quan hang cong ban ((hanh cham) or (nhanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu quan - thanh trung quan hang cong ban ((hanh cham) OR (nhanh bac)).
• Adding a wildcard symbol may retrieve word variants: doc hieu quan - thanh trung quan hang cong ban ((hanh cham) or (nhanh bac))*.