Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
cao hoa » cao hoat, cao khoa, cau hoa
va nang » van nang, da nang, kha nang
tuc va » thuc va, truc va, duc va
di cua » dai cua, doi cua, de cua
va lam » van lam, va lap

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 ((va nang) OR (cam nang)) cao hoa. hieu va lam ((tuc va) or (tuc xa)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((va nang) OR (cam nang)) cao hoa. hieu va lam ((tuc va) OR (tuc xa)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((va nang) OR (cam nang)) cao hoa. hieu va lam ((tuc va) or (tuc xa)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((va nang) OR (cam nang)) cao hoa. hieu va lam ((tuc va) or (tuc xa)) thanh di cua tre*.