Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
chinh cau » chinh chau, chinh ca, chinh can
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
chan cau » phan cau, can cau, nhanh cau
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 ((trang va) OR (lan van)) nhung cong tan ((chan cau) OR (chinh cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - hanh ((trang va) or (lan van)) nhung cong tan ((chan cau) OR (chinh cau))~".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - hanh ((trang va) or (lan van)) nhung cong tan ((chan cau) OR (chinh cau))*.