Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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 ty nang xa hoi. ((hieu van) or (thien van)) lam ((luc va) OR (tuc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. ((hieu van) OR (thien van)) lam ((luc va) OR (tuc va)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. ((hieu van) or (thien van)) lam ((luc va) OR (tuc va)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. ((hieu van) or (thien van)) lam ((luc va) OR (tuc va)) hanh vi cuu tre*.