Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hinh tai » chinh tai, hinh thai, hinh bai
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, dam thuc
cua te » cua tu
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v nang xa hoi. hieu qua ((cam tuc) OR (nam thuc)) va ((hinh tai) or (dung tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang xa hoi. hieu qua ((cam tuc) OR (nam thuc)) va ((hinh tai) OR (dung tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang xa hoi. hieu qua ((cam tuc) OR (nam thuc)) va ((hinh tai) or (dung tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. hieu qua ((cam tuc) OR (nam thuc)) va ((hinh tai) or (dung tai)) cua te*.