Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cau tren » cu tren, dau tren, ca tren
lam thuc » lam thuoc, am thuc, nam thuc
cua viet » ca viet, hoa viet, cua vat
hang tai » hang va, dung tai
thuc dan » thuc hanh, hoc dan, thuc vat
viec lam » viec va
hang di » hang doi, hang vi, hang dien
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky lang xa hoi. hieu viec lam thuc dan ((hang di) or (hang tai)) ((cua viet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. hieu viec lam thuc dan ((hang di) OR (hang tai)) ((cua viet) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu viec lam thuc dan ((hang di) or (hang tai)) ((cua viet) or (cau tren))*.