Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cac thu » cach thuc, cac thoi
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cac tu » cach tu, cac du, tac tu

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