Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
trung can » trung cap, trung van, trong can
dung cong » dung trong
tung can » tung dan, trung cap, tung manh
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo tieu)) xanh - thanh ((tung can) OR (trung can)) dung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) xanh - thanh ((tung can) OR (trung can)) dung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo tieu)) xanh - thanh ((tung can) OR (trung can)) dung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) xanh - thanh ((tung can) OR (trung can)) dung cong tan toan cau*.