Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, dam thuc
va dung » van dung, va duong, vat dung
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu qua ((cam tuc) OR (nam thuc)) va dung tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu qua ((cam tuc) OR (nam thuc)) va dung tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu qua ((cam tuc) OR (nam thuc)) va dung tai cua tre*.