Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
nang xa » lang xa, nang ma, mang xa
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cac duc » cac du, cac dac, cac nuoc
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 ty ((nang xa) OR (nang x)) hoi. hieu ve ((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 ty ((nang xa) OR (nang x)) hoi. hieu ve ((cac duc) OR (cao duc)) van hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang xa) OR (nang x)) hoi. hieu ve ((cac duc) or (cao duc)) van hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang xa) OR (nang x)) hoi. hieu ve ((cac duc) or (cao duc)) van hanh vai cua tu*.