Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan
dang xay » dang van, van xay
viec lam » viec va
hang di » hang doi, hang vi, hang dien
cuu tre » cua tre, cau tren, cau treo
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
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 dang xay hoi. hieu viec lam ((thuc dan) OR (thuc vat)) hang di ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xay hoi. hieu viec lam ((thuc dan) OR (thuc vat)) hang di ((cua triet) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xay hoi. hieu viec lam ((thuc dan) OR (thuc vat)) hang di ((cua triet) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xay hoi. hieu viec lam ((thuc dan) OR (thuc vat)) hang di ((cua triet) or (cuu tre))*.