Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc gia » thuc giai, thue gia, thuc dia
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay
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: ((te sach) or (thu hoach)) ky tang ma hoi. hieu va nam thuc gia thanh ((di cua) or (dai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky tang ma hoi. hieu va nam thuc gia thanh ((di cua) OR (dai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky tang ma hoi. hieu va nam thuc gia thanh ((di cua) or (dai cua)) viet*.