Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung pha » trung phan, trung phat, truong phan
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
trung ha » trung hoc, trung tam, trung cap
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cap » khan cap, thanh lap, thanh cac

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 xanh - thanh ((trung pha) or (trung ha)) hang cong tac than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((trung pha) OR (trung ha)) hang cong tac than cap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((trung pha) or (trung ha)) hang cong tac than cap*.