Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cau tren » cu tren, dau tren, ca tren
thuc dan » thuc hanh, hoc dan, thuc vat
cac thuc » cach thuc, cac thu, can thuc
viec cac » vien cac, viec cua, viec lam
dan hang » ban hang, van hang, dat hang
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sach ky » sac ky, sach y, sach ty
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cua triet, dua tren
cuu tre » cau treo
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang xa hoi. hieu viec cac thuc dan hang di ((cua tre) or (((cuu tre) OR (cau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu viec cac thuc dan hang di ((cua tre) OR (((cuu tre) OR (cau tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu viec cac thuc dan hang di ((cua tre) or (((cuu tre) OR (cau tren))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu viec cac thuc dan hang di ((cua tre) or (((cuu tre) OR (cau tren))))*.