Perhaps you should try some spelling variations:
phuong cham » phuong phap, phuong thao
thong dung » thong cong, thong thuong
doc hieu » toc thieu, hoc thieu, hoc hien
dung dat » dung va, dung tai
dat khan » dat khanh, dat thanh, bat khanh
khan cap » khan ap, than cap, khoan cam
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 cham) OR (phung van)) thong dung dat khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu ca - thanh ((phuong cham) OR (phung van)) thong dung dat khan cap*".