Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
tran van » luan van
cong tan » cong tac, cong san, cong thanh
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu
lan van » luan van, lang van, tan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu xanh - hanh ((tran van) OR (lan van)) nhung cong tan ((chan cau) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - hanh ((tran van) or (lan van)) nhung cong tan ((chan cau) OR (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - hanh ((tran van) or (lan van)) nhung cong tan ((chan cau) OR (phan cau))*.