Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, dam thuc
va dung » van dung, va duong, vat dung
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu va ((cam tuc) OR (nam thuc)) va dung tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cuc tre*.