Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cua hang » cua dang, cua nhung, cua cong
cong tac » cong ty
than cua » nhan cua, thai cua, ban cua
khan cap » than cap, khoan cam, phan cac
khan ap » han ap, khan dam

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 - canh tranh cua hang cong tac ((than cua) or (((khan cap) OR (khan ap))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - canh tranh cua hang cong tac ((than cua) OR (((khan cap) OR (khan ap)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - canh tranh cua hang cong tac ((than cua) or (((khan cap) OR (khan ap))))".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - canh tranh cua hang cong tac ((than cua) or (((khan cap) OR (khan ap))))*.