Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh lap » thanh san, phan lap, thanh hai
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
bac day » bac dai, bac dan, bac thay
ty nang » ky nang, ty hang, ly nang
van bac » van ban, van bao, van hac

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 ((ty nang) or (ty xang)) xa hoi. hieu van bac day va thanh lap ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) xa hoi. hieu van bac day va thanh lap ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty xang)) xa hoi. hieu van bac day va thanh lap ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) xa hoi. hieu van bac day va thanh lap ((cua triet) OR (su triet))*.