Perhaps you should try some spelling variations:
dua tren » dung tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
te cac » tu cac, ve cac, te cao
soc va » loc va, doc va, goc va
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: te cac ky lang xa hoi. hieu va tham ((soc va) or (hoc va)) hanh vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky lang xa hoi. hieu va tham ((soc va) OR (hoc va)) hanh vi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te cac ky lang xa hoi. hieu va tham ((soc va) or (hoc va)) hanh vi ((dua tren) or (cua te))*.