Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam tu
va thanh » ban thanh, va tinh, le thanh
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
cua te » cua tu

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 v nang cao hoi. hieu va ((nam thuc) OR (nam thu)) ((va thanh) or (gia thanh)) thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang cao hoi. hieu va ((nam thuc) OR (nam thu)) ((va thanh) OR (gia thanh)) thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang cao hoi. hieu va ((nam thuc) OR (nam thu)) ((va thanh) or (gia thanh)) thai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach v nang cao hoi. hieu va ((nam thuc) OR (nam thu)) ((va thanh) or (gia thanh)) thai cua te*.