Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc hien, hoc viet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
cong tang » cong thang, cong tan, cong lang
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
va hang » van hang, va nang, va lang
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chiet) or (hoc nhiet)) tach - hanh trinh va hang ((cong tac) or (cong tang)) han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chiet) OR (hoc nhiet)) tach - hanh trinh va hang ((cong tac) OR (cong tang)) han tap.
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) or (hoc nhiet)) tach - hanh trinh va hang ((cong tac) or (cong tang)) han tap*.