Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
cam tuc » cam xuc, cam tu, dam thuc
va dung » van dung, va duong, vat dung
tu sac » tu sach, tu cac, tu san
cua te » cua tu
sac ky » cac ky, sai ky

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 xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. hieu va ((cam tuc) OR (nam thuc)) va dung tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai ((cua tre) OR (cua te))*.