Perhaps you should try some spelling variations:
tmanh tung » thanh tung, thanh trung, manh hung
hieu cach » hieu cac, chieu sach, hieu ca
manh tung » manh hung, thanh tung
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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: hoc hieu cach - ((manh tung) or (tmanh tung)) cua dung ((cong tan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((manh tung) OR (tmanh tung)) cua dung ((cong tan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - ((manh tung) or (tmanh tung)) cua dung ((cong tan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((manh tung) or (tmanh tung)) cua dung ((cong tan) OR (cong san)) toan cau*.