Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
cao duc » dao duc, cao suc, giao duc
cac duc » cac du, cac dac, cac nuoc
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, xach tay
cua tu » cua tuc, cua su, cua cu

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 ty)) nang xa hoi. hieu van ((cac duc) or (cao duc)) van hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach ty)) nang xa hoi. hieu van ((cac duc) OR (cao duc)) van hanh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach ty)) nang xa hoi. hieu van ((cac duc) or (cao duc)) van hanh vai cua tu*.