Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam tu
tuc cac » tu cac, tich cac
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
dan vai » dan va, dan vat, den vai
dan tai » van tai, dan thi, han tai
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: tuc cac ky lang xa hoi. hieu va ((nam thuc) OR (nam thu)) va ((dan vai) or (dan tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuc cac ky lang xa hoi. hieu va ((nam thuc) OR (nam thu)) va ((dan vai) OR (dan tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tuc cac ky lang xa hoi. hieu va ((nam thuc) OR (nam thu)) va ((dan vai) or (dan tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tuc cac ky lang xa hoi. hieu va ((nam thuc) OR (nam thu)) va ((dan vai) or (dan tai)) cuu tre*.