Perhaps you should try some spelling variations:
tinh voi » trinh voi, tinh doi, binh voi
voi cua » hoi cua, doi cua, moi cua
va tinh » may tinh
van lam » van nam
van cam » van nam, van cau, van dam
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc 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 tu ((nang xa) or (nang ma)) hoi. hieu ((van cam) OR (van lam)) xuc va tinh voi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((nang xa) OR (nang ma)) hoi. hieu ((van cam) OR (van lam)) xuc va tinh voi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((nang xa) or (nang ma)) hoi. hieu ((van cam) OR (van lam)) xuc va tinh voi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((nang xa) or (nang ma)) hoi. hieu ((van cam) OR (van lam)) xuc va tinh voi cua tre*.