Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
te sach » toc sach
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
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 y ((tang ma) or (van xay)) hoi. hieu va chat thuc va hanh ((di cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((tang ma) OR (van xay)) hoi. hieu va chat thuc va hanh ((di cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach y ((tang ma) or (van xay)) hoi. hieu va chat thuc va hanh ((di cua) or (dai cua)) te*.