Perhaps you should try some spelling variations:
phuong thao » phuong phap, phuong thuc
toc hieu » toc thieu, doc hieu, hoc thieu
con dang » con bang, con nang, con duong
dang van » hoang van, hang va
van than » van thanh, van thang, van tuan
than cap » khan cap, thanh lap, thanh cac
hieu ca » hieu cac, hieu cua, hieu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu ca - thanh ((phuong thao) or (phung van)) con dang van than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu ca - thanh ((phuong thao) OR (phung van)) con dang van than cap*.