Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
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 thu) OR (sach tham)) nang xa hoi. hieu va cac tu va hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) OR (sach tham)) nang xa hoi. hieu va cac tu va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) OR (sach tham)) nang xa hoi. hieu va cac tu va hanh di cua tre*.