Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 ve cam ((xuc va) or (luc va)) hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu ve cam ((xuc va) OR (luc va)) hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu ve cam ((xuc va) or (luc va)) hanh vi ((cua tre) or (cau tren))*.