Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
cac thuc » cach thuc, cac thu, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan dan » dang dan, ban dan, dao dan
dan den » ban den, van den, dan dung
den cua » dien cua, de cua, ben cua
cua tre » cua te, cuu tre, cua triet
vu sai » vu hai, vu san, vu dai
sai ky » sac ky
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)) cac thuc dan dan 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)) cac thuc dan dan den cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang x hoi. ((hieu vien) OR (hieu viec)) cac thuc dan dan den cua tre*.