Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach thuc » cach thuc, bach thu, thach 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 bach thuc dan ba den ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang x hoi. hieu vien bach 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 bach thuc dan ba den ((cua tre) or (cuu tre))*.