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, cuu tre, cua triet
van lam » van nam
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
xuc va » duc va, luc 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 dang xa hoi. hieu van lam ((((xuc va) OR (xac va))) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xa hoi. hieu van lam ((((xuc va) OR (xac va))) OR (tuc va)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang xa hoi. hieu van lam ((((xuc va) OR (xac va))) or (tuc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu van lam ((((xuc va) OR (xac va))) or (tuc va)) hanh vi cua tre*.