Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
thu sach » thuat sach, thuoc sach, thu hoach
cac tuc » cac toc, cac tu, cac tac
tai cua » thai cua, tai cuc, tri cua
tu sach » su sach, te sach, tu cach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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) OR (thu sach)) ky dang xa hoi. hieu ve cac tuc ((van minh) or (van thanh)) tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky dang xa hoi. hieu ve cac tuc ((van minh) OR (van thanh)) tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky dang xa hoi. hieu ve cac tuc ((van minh) or (van thanh)) tai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky dang xa hoi. hieu ve cac tuc ((van minh) or (van thanh)) tai cua triet*.