Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
sach ki » sach kinh, sach bai, sach kem
ki nang » ky nang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
cua cu » cua chu, cua cau, cua su

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