Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va huong » va thuong, va phuong, va tuong
xa huong » xa phuong, xa muong, ga huong
doi cua » dai cua, hoi cua, dong cua
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, dam thuc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

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