Perhaps you should try some spelling variations:
sach tai » sach bai, sach tham, sach dao
chat duc » chat xuc, chat doc, chet duoc
sach thi » sach thu, sach thieu, sach tham
van anh » van thanh, tuan anh, van minh
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
hang xa » hoang xa, hang va, hang ca
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach thi) OR (sach tai)) hang xa hoi. ((hieu va) or (hieu qua)) chat duc van anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach thi) OR (sach tai)) hang xa hoi. ((hieu va) OR (hieu qua)) chat duc van anh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach thi) OR (sach tai)) hang xa hoi. ((hieu va) or (hieu qua)) chat duc van anh va cua tre*".