Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
theo chieu » theo tieu, ho chieu, thi chieu
cong thanh » dong thanh, cong trinh, truong thanh
theo chu » cho chu, chao chu, theo yeu
trinh va » trinh van, trinh vat, trinh ve
va duong » van duong, va tuong, va huong
cong tan » cong tac, cong san, cong ty
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) OR (theo chu)) xanh - hanh trinh va duong ((cong tan) or (cong thanh)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) xanh - hanh trinh va duong ((cong tan) OR (cong thanh)) than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (theo chu)) xanh - hanh trinh va duong ((cong tan) or (cong thanh)) than tap".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (theo chu)) xanh - hanh trinh va duong ((cong tan) or (cong thanh)) than tap*.