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

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) OR (hang dien)) ((cua tre) or (cuu tre))~.
• 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) OR (hang dien)) ((cua tre) OR (cuu tre)).
• 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) OR (hang dien)) ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu viec cac thuc dan ((hang di) OR (hang dien)) ((cua tre) or (cuu tre))*.