Perhaps you should try some spelling variations:
sach kem » hanh kem
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach kem) or (sach y)) nang xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach kem) OR (sach y)) nang xa hoi. hieu ve cac ((xuc va) OR (tuc va)) hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: te ((sach kem) or (sach y)) nang xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vi ca viet*.