Perhaps you should try some spelling variations:
phuong thao » phuong phap, phuong thuc
cuong dung » tuong duong, ung dung, thong dung
doc hieu » toc thieu, hoc thieu, hoc hien
dung van » duong van, dung va, dang van
van chat » cao chat
chat cap » chat cam, chat cao, cao cap
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: doc hieu ca - thanh ((phuong thao) or (phung van)) cuong dung van chat cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu ca - thanh ((phuong thao) OR (phung van)) cuong dung van chat cap*.