Perhaps you should try some spelling variations:
tinh tap » tinh tai, tinh tay, tinh toan
va triet » va thiet, va trien, ve triet
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
va tinh » may tinh
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
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) or (su sach)) y nang x hoi. ((hieu ve) or (lieu va)) cau luc va tinh tap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang x hoi. ((hieu ve) OR (lieu va)) cau luc va tinh tap va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang x hoi. ((hieu ve) or (lieu va)) cau luc va tinh tap va triet*.