Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
huong doi » huong dan, trong doi, dung doi
danh doi » danh di, thanh doi, dung doi
cac tuc » cac toc, cac tu, cac tac
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ma hoi » mai hoi, xa hoi, ma hoa
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: so sach ky nang ((ma hoi) or (dai hoi)). hieu ve cac tuc xa ((danh doi) or (huong doi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((ma hoi) OR (dai hoi)). hieu ve cac tuc xa ((danh doi) OR (huong doi)) cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (dai hoi)). hieu ve cac tuc xa ((danh doi) or (huong doi)) cua triet*.