Perhaps you should try some spelling variations:
hanh trang » thanh trung, hanh trinh, minh trang
hieu tinh » chieu tinh, lieu tinh, kieu tinh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
thai cua » than cua, tai cuc, tri cua
khan cap » khan ap, than cap, khoan cam

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) or (hanh trang)) cua dung cong tac ((thai cua) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - ((canh tranh) OR (hanh trang)) cua dung cong tac ((thai cua) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - ((canh tranh) or (hanh trang)) cua dung cong tac ((thai cua) or (khan cap))*.