Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh van » thanh san, thanh toan, thanh phan
van cua » vang cua, ban cua, dan cua
luc gia » luoc gia, duc gia, quoc gia
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai
o hai » co hai, so hai, o lai
x hoi » xa hoi, o hoi, x ho

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