Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » hanh chinh
bien tinh » bi tinh, yen tinh, diep tinh
hang cong » dang cong, hang nong, bang cong
qua hang » cua hang, mua hang, qua mang
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tinh) or (bien tinh)) - ((hanh trinh) or (canh tranh)) qua hang cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (bien tinh)) - ((hanh trinh) OR (canh tranh)) qua hang cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) or (bien tinh)) - ((hanh trinh) or (canh tranh)) qua hang cong tan van ban*.