Perhaps you should try some spelling variations:
hung thang » cang thang, hung tran
cong thang » cong thanh, cang thang, cong thong
hieu cach » hieu cac, chieu sach, hieu ca
hang hang » nang hang, cang thang, lang thang
hoc hieu » hoc thieu, hoc hien, doc hieu
ca nhung » cua nhung, cam nhung, va nhung
cong tan » cong tac, cong san, cong thanh
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 - ((hang hang) OR (hung thang)) ca nhung ((cong tan) or (cong thang)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((hang hang) OR (hung thang)) ca nhung ((cong tan) OR (cong thang)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - ((hang hang) OR (hung thang)) ca nhung ((cong tan) or (cong thang)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((hang hang) OR (hung thang)) ca nhung ((cong tan) or (cong thang)) toan cau*.