Perhaps you should try some spelling variations:
dong thai » duong thai, dong tai, cong thai
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
xa dong » ha dong, van dong, lao dong
cua tre » cuu tre, cua triet, dua tren
su cac » tu cac, su cao, eu cac
su can » su van, su cao, tu can
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cac) OR (su can)) ky nang xa hoi. hieu van cam tuc xa dong thai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (su can)) ky nang xa hoi. hieu van cam tuc xa dong thai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cac) OR (su can)) ky nang xa hoi. hieu van cam tuc xa dong thai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((su cac) OR (su can)) ky nang xa hoi. hieu van cam tuc xa dong thai ((cua tre) or (cua te))*.