Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tran » thanh trang, thanh toan, thanh tra
duong sach » duong manh
hoc thieu » toc thieu, hoc hien
cong sach » ong sach, song sach, luong sach
tran van » luan van
van dung » van dong, xay dung, tin dung
tham cao » thai cao, thuat cao, tham canh
khao » khac, khai, thao

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: hoc thieu xanh - thanh tran van dung ((cong sach) OR (duong sach)) ((tham cao) OR (tham khao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh tran van dung ((cong sach) or (duong sach)) ((tham cao) OR (tham khao))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tran van dung ((cong sach) or (duong sach)) ((tham cao) OR (tham khao))*.