Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
xuc va » duc va, luc va
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y dang xa hoi. hieu van cam ((((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: su sach y dang xa hoi. hieu van cam ((((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: "su sach y dang xa hoi. hieu van cam ((((xuc va) OR (xac va))) or (tuc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xa hoi. hieu van cam ((((xuc va) OR (xac va))) or (tuc va)) hanh vi cua tre*.