Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
tieu sach » chieu sach, dien sach, te sach
dung cong » dung trong
tong cong » trong cong, cong cong, dang cong
tran van » luan van
than cao » toan cao, thai cao, than cap
khan ap » khan cap, han ap, khan dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh tran van ((dung cong) or (tong cong)) san ((than cao) or (khan ap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh tran van ((dung cong) OR (tong cong)) san ((than cao) OR (khan ap)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh tran van ((dung cong) or (tong cong)) san ((than cao) or (khan ap))*.