Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. hieu van cam ((xuc va) or (tuc va)) hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu van cam ((xuc va) OR (tuc va)) hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu van cam ((xuc va) or (tuc va)) hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu van cam ((xuc va) or (tuc va)) hanh vi ((cua tre) OR (cuu tre))*.