Perhaps you should try some spelling variations:
giang van » hoang van, gian dan, giang day
dang van » hoang van, hang va
cac thuc » cach thuc, cac thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
danh ban » doanh ban, danh bat, danh bac
ban quan » van quan
quan tre » quan tren, quan tri, quang tri
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh

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 ((giang van) or (dang van)) hoi. lieu va ((cac thuc) OR (can thuc)) va danh ban quan tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((giang van) OR (dang van)) hoi. lieu va ((cac thuc) OR (can thuc)) va danh ban quan tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((giang van) or (dang van)) hoi. lieu va ((cac thuc) OR (can thuc)) va danh ban quan tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((giang van) or (dang van)) hoi. lieu va ((cac thuc) OR (can thuc)) va danh ban quan tre*.