Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
truc va » thuc va, thuc vat, trung va
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
van cam » van nam, van lam, van cau
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
tuc va » thuc va, tuc xa, duc va
vi cua » vai cua, di cua
xuc va » duc va, luc va, xac 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 ha hoi. hieu van cam ((xuc va) or (((tuc va) OR (truc va)))) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang ha hoi. hieu van cam ((xuc va) OR (((tuc va) OR (truc va)))) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang ha hoi. hieu van cam ((xuc va) or (((tuc va) OR (truc va)))) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang ha hoi. hieu van cam ((xuc va) or (((tuc va) OR (truc va)))) hanh vi cua tre*.