Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach thu » sach thue, sach thieu, sach tham
lam thuc » lam thuoc, am thuc, nam thuc
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
mang xa » lang xa, mang may, dang xay
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach thu ((((van xay) or (mang xa))) or (nang x)) hoi. hieu van lam thuc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach thu ((((van xay) OR (mang xa))) OR (nang x)) hoi. hieu van lam thuc va hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach thu ((((van xay) or (mang xa))) or (nang x)) hoi. hieu van lam thuc va hanh vi su triet*.