Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
va dung » van dung, va duong, vat dung
cam tuc » cam xuc, cam tu, dam thuc
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang va
dang ha » dong ha, dung ha, lang ha
sac ky » cac ky, sai ky
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 xa) OR (dang ha)) hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((dang xa) OR (dang ha)) hoi. hieu va ((cam tuc) OR (nam thuc)) va dung tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((dang xa) OR (dang ha)) hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((dang xa) OR (dang ha)) hoi. hieu va ((cam tuc) or (nam thuc)) va dung tai cua tre*.