Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cong tacg » cong tang, cong thang, cong tan
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
phan lap » phan dau
va hang » van hang, va nang, va lang

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 tach - hanh trinh va hang ((cong tac) or (cong tacg)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trinh va hang ((cong tac) OR (cong tacg)) phan lap.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trinh va hang ((cong tac) or (cong tacg)) phan lap*.