Perhaps you should try some spelling variations:
theo chiet » theo chieu, thep thiet
chiet tach » chieu sach
nhung cong » dung cong, thong cong, nhung don
hanh tran » hanh trang, thanh tran, hanh tram
hang cong » dang cong, hang nong, bang cong
tran van » luan van
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chiet tach - hanh tran van ((nhung cong) OR (hang cong)) san ((than cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chiet tach - hanh tran van ((nhung cong) OR (hang cong)) san ((than cau) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chiet tach - hanh tran van ((nhung cong) OR (hang cong)) san ((than cau) or (khan cap))".
• Adding a wildcard symbol may retrieve word variants: theo chiet tach - hanh tran van ((nhung cong) OR (hang cong)) san ((than cau) or (khan cap))*.