Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu tieng, nhieu viec
hieu viec » nhieu viec, hieu ve, sieu viet
thuc dan » thuc hanh, hoc dan, thuc vat
dai thuc » dan thuc, dai thu, dai thua
cua tre » cua te, cuu tre, cua triet
den cua » dien cua, de cua, ben cua
sai ky » sac ky
dan ba » dan bac, dan ca, dan va
ba den » ban den, va den, ba don
vu sai » vu hai, vu san, vu dai
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: vu sai ky nang x hoi. ((((hieu vien) OR (hieu viec))) or (thieu nien)) dai thuc dan ba den cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang x hoi. ((((hieu vien) OR (hieu viec))) OR (thieu nien)) dai thuc dan ba den cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang x hoi. ((((hieu vien) OR (hieu viec))) or (thieu nien)) dai thuc dan ba den cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang x hoi. ((((hieu vien) OR (hieu viec))) or (thieu nien)) dai thuc dan ba den cua tre*.