Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, phong chong
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
tran van » luan van
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap
lan van » luan van, lang van, tan van

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

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