Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
lang van » dang van, tang van, hoang van
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va danh, ban hanh
cua tuc » cua duc, cua tu, cua thuoc
hieu ve » hieu va, hieu van
sach o » sach lo, sac o, sach y
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o ((lang van) OR (dang xay)) hoi. hieu ve cam thuc ((va hanh) OR (va thanh)) vai cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o ((lang van) or (dang xay)) hoi. hieu ve cam thuc ((va hanh) OR (va thanh)) vai cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach o ((lang van) or (dang xay)) hoi. hieu ve cam thuc ((va hanh) OR (va thanh)) vai cua tuc*.