Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
tang van » dang van, hoang van, trong van
su sach » so sach
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
vu sach » vu bach, vu khach
ve cam » ve cham, ve cac, va cam
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky tang van hoi. hieu ve cam thuc van hanh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky tang van hoi. hieu ve cam thuc van hanh ((di cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky tang van hoi. hieu ve cam thuc van hanh ((di cua) or (dai cua)) tre*.