Perhaps you should try some spelling variations:
hoc xanh » hoc anh, hoc hanh, hoc danh
cao dung » cao dang, cao dong, cap dung
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
he xanh » heo xanh
cao ung » cac ung, cho ung, bao ung

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho ((he xanh) or (hoc xanh)) - anh tuan ((cao dung) OR (cao ung)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho ((he xanh) OR (hoc xanh)) - anh tuan ((cao dung) OR (cao ung)) cong tan toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho ((he xanh) or (hoc xanh)) - anh tuan ((cao dung) OR (cao ung)) cong tan toan cao*".