Perhaps you should try some spelling variations:
cua triet » su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
ky dang » ky danh
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
tu van » tu va

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) OR (ky nang)) xa hoi. hieu ve cac tu 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) OR (ky nang)) xa hoi. hieu ve cac tu 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) OR (ky nang)) xa hoi. hieu ve cac tu van hanh vai ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) OR (ky nang)) xa hoi. hieu ve cac tu van hanh vai ((cua triet) or (cua viet))*.