Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
danh doi » danh di, thanh doi, dung doi
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
doi cua » dai cua, hoi cua
va danh » va dinh, va dan, va hanh
va sac » va cac, va suc, va sap
va san » va ban
cua te » cua tu
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: ((va sac) OR (va san)) ky nang x hoi. hieu vien ((cac duc) or (cac dac)) va danh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((va sac) OR (va san)) ky nang x hoi. hieu vien ((cac duc) OR (cac dac)) va danh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((va sac) OR (va san)) ky nang x hoi. hieu vien ((cac duc) or (cac dac)) va danh doi cua te".
• Adding a wildcard symbol may retrieve word variants: ((va sac) OR (va san)) ky nang x hoi. hieu vien ((cac duc) or (cac dac)) va danh doi cua te*.