Perhaps you should try some spelling variations:
sach thu » sach thue, sach tham, cach thuc
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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 thu) OR (sach thieu)) nang xa hoi. hieu ((ve cam) or (ve cac)) duc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach thieu)) nang xa hoi. hieu ((ve cam) OR (ve cac)) duc va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) OR (sach thieu)) nang xa hoi. hieu ((ve cam) or (ve cac)) duc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) OR (sach thieu)) nang xa hoi. hieu ((ve cam) or (ve cac)) duc va hanh doi cua tre*.