Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
dang xay » dang van, van xay
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
lang ha » long ha
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((lang ha) or (dang xay)) hoi. hieu ve cham thuc van hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang ha) OR (dang xay)) hoi. hieu ve cham thuc van hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang ha) or (dang xay)) hoi. hieu ve cham thuc van hanh vi cua tu*.