Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
hieu cach » hieu cac, chieu sach, hieu ca
hoc hieu » hoc thieu, hoc hien, doc hieu
quy dung » duy dung, qua dung, quyet dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
anh tan » anh tuan, anh toan, anh tang
tan quy » tran quy, van quy, dan quy

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 - anh tan quy dung phuong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - anh tan quy dung phuong ((dan toan) OR (dan than)) ban*.