Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
lo van » le van, vo van, so van
anh va » hanh va
va cua » va chua, via cua, ca cua

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