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