Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
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: ((tu sach) or (so sach)) ky lang xa hoi. hieu van cau ((truc va) or (thuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky lang xa hoi. hieu van cau ((truc va) OR (thuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky lang xa hoi. hieu van cau ((truc va) or (thuc va)) hanh vi cua tre*.