Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cac thuc » cach thuc, cac thu, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
vu sai » vu hai, vu san, vu dai
sai ky » sac ky
dan ba » dan bac, dan ca, dan va
ba den » ban den, va den, ba don
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 cac thuc dan ba den ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang x hoi. hieu vien cac thuc dan ba den ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang x hoi. hieu vien cac thuc dan ba den ((cua tre) OR (cuu tre))*.