Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
cac dac » cac dan, cac dai, cac bac
vai cua » dai cua, hai cua, lai cua
cac duc » cac du, cao duc, cac nuoc
hieu ve » hieu va, hieu van
te sach » toc sach
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ky nang x hoi. hieu ve ((cac duc) OR (cac dac)) van hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. hieu ve ((cac duc) OR (cac dac)) van hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang x hoi. hieu ve ((cac duc) OR (cac dac)) van hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x hoi. hieu ve ((cac duc) OR (cac dac)) van hanh vai cua tu*.