Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach tham
thanh di » thanh doi, thanh de, thanh do
hang ca » hang va, nang cao, hang tai
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet
ca hoi » cau hoi, cua hoi, xa hoi
cam tu » cam thu, nam tu, dam tu
tu gia » tu giao, tu giac, tu giay
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thi) OR (sach thieu)) hang ca hoi. ((hieu va) or (lieu va)) cam tu gia thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thi) OR (sach thieu)) hang ca hoi. ((hieu va) OR (lieu va)) cam tu gia thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thi) OR (sach thieu)) hang ca hoi. ((hieu va) or (lieu va)) cam tu gia thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thi) OR (sach thieu)) hang ca hoi. ((hieu va) or (lieu va)) cam tu gia thanh di cua tre*.