Perhaps you should try some spelling variations:
hanh mai » hanh ma, hanh mau, hanh may
va triet » va thiet, va trien, ve triet
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
xa hanh » xa thanh, xa khanh, va hanh
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao

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 (bo sach)) y nang cao hoi. hieu va cao tuc xa hanh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y nang cao hoi. hieu va cao tuc xa hanh mai va triet.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) y nang cao hoi. hieu va cao tuc xa hanh mai va triet*.