Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ky dang » ky nang
ky danh » ky anh
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
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky dang) OR (ky danh)) 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 sac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cam tuc) OR (nam thuc)) va dung tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cuc tre*.