Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
khong cong » thong cong, khong cang, chong cong
thien anh » thien danh, tien anh, thien thanh
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban
nang du » nang tu, nang luc, nang doc

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) OR (thien anh)) - ganh ((nang suat) OR (nang du)) khong cong tan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (thien anh)) - ganh ((nang suat) or (nang du)) khong cong tan toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (thien anh)) - ganh ((nang suat) or (nang du)) khong cong tan toan ban*.