Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc xanh » hoc anh, hoc hanh, hoc danh
cong tan » cong tac, cong san, cong thanh
cho hoc » co hoc, khoa hoc
va dang » van dang, va lang, da dang
va nang » van nang, da nang, cam nang
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: cho hoc xanh - hanh trinh ((va dang) OR (va nang)) cong tan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho hoc xanh - hanh trinh ((va dang) OR (va nang)) cong tan van ban".
• Adding a wildcard symbol may retrieve word variants: cho hoc xanh - hanh trinh ((va dang) OR (va nang)) cong tan van ban*.