Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hieu cach » hieu cac, chieu sach, hieu ca
hang hang » nang hang, cang thang, hung thang
thanh can » thanh san, thanh van, thanh tan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua hang » cua dang, cua nhung, cua cong
ca tang » cao tang, ha tang, gia tang
can cau » van cau, ban cau, ca cau

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 ((ca tang) or (cua hang)) cong thanh can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - hang hang ((ca tang) OR (cua hang)) cong thanh can cau*.