Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
manh cua » doanh cua, ban cua
cua cua » cua chua, ca cua, qua cua
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, hoc sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
co sach » bo sach, cuon sach, hoc sach
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va
loc va » hoc va

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) or (co sach)) ty nang xa hoi. hieu ve cau ((luc va) OR (loc va)) manh cua cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty nang xa hoi. hieu ve cau ((luc va) OR (loc va)) manh cua cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) ty nang xa hoi. hieu ve cau ((luc va) OR (loc va)) manh cua cua triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ty nang xa hoi. hieu ve cau ((luc va) OR (loc va)) manh cua cua triet*.