Perhaps you should try some spelling variations:
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
ban hanh » ban hang
hieu van » thien van, lieu va, hieu ve
pham cuc » pham chuc, pham duc, pham cua
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
lam cuc » lam cua, lam duoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua

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

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