Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van pham » san pham, van phat, van tham
van phan » van phong, van thanh, luan phan
thuc day » thuc dan, thuc vat
day hang » dat hang, dai hang, day nang
hang doi » hang di, hang loi, huong doi
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang co hoc. hieu ((van pham) or (van phan)) thuc day hang doi ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang co hoc. hieu ((van pham) OR (van phan)) thuc day hang doi ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang co hoc. hieu ((van pham) or (van phan)) thuc day hang doi ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang co hoc. hieu ((van pham) or (van phan)) thuc day hang doi ((cua tu) OR (cua cu))*.