Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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: thu sach y nang xa hoi. hieu van cam ((xuc va) or (luc va)) hanh vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu van cam ((xuc va) OR (luc va)) hanh vi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu van cam ((xuc va) or (luc va)) hanh vi ((dua tren) or (cua te))*.