Perhaps you should try some spelling variations:
trinh thuyet » trinh thiet, trinh tuyen, trinh truyen
thuyet dung » thuyet dong, thuyet hung, thuyet ung
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
cong tan » cong thanh, cong ty, cong ha
cong tac » cong ty
toan tap » toan ban

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

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