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
thuc va » thuc vat, thuc dan, thuc day
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
tuc va » truc 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 dang xa hoi. hieu van lam ((xuc va) or (((tuc va) OR (thuc 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 (((tuc va) OR (thuc 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 (((tuc va) OR (thuc 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 (((tuc va) OR (thuc va)))) hanh vi cua tre*.