Perhaps you should try some spelling variations:
hung thang » cang thang, hung tran
nhung cong » dung cong, thong cong, hang cong
hieu cac » hieu luc, hieu van, vien cac
thang ca » thang cua, hang ca, tang ca
ca nhung » cua nhung, cam nhung, va nhung
van toan » van tuan, van thanh, manh toan
hieu va » lieu va, hieu qua
van tan » van tuan, van ban, van tai

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 cac) OR (hieu va)) - hung thang ca nhung cong ((van toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cac) OR (hieu va)) - hung thang ca nhung cong ((van toan) OR (van tan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cac) OR (hieu va)) - hung thang ca nhung cong ((van toan) or (van tan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cac) OR (hieu va)) - hung thang ca nhung cong ((van toan) or (van tan)) cau*.