Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
bo sach » co sach
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
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: ((bo sach) or (hoc sach)) ky nang x hoi. hieu van cam luc va tinh va ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (hoc sach)) ky nang x hoi. hieu van cam luc va tinh va ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (hoc sach)) ky nang x hoi. hieu van cam luc va tinh va ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc sach)) ky nang x hoi. hieu van cam luc va tinh va ((cua triet) OR (va triet))*.