Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
te sach » toc sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang van
lang ha » long ha
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 xa) OR (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 xa) OR (lang ha))) OR (dang xay)) hoi. hieu ve cham thuc van hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((((lang xa) OR (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 xa) OR (lang ha))) or (dang xay)) hoi. hieu ve cham thuc van hanh vi cua tu*.