Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien
ve triet » va trien
hieu va » lieu va, hieu qua
va chai » va cai, va chat, va cham
chai tu » cai tu, choi tu, chay tu
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ma hoi. hieu va chai tu ((ban thanh) or (gia thanh)) vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu va chai tu ((ban thanh) OR (gia thanh)) vi ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu va chai tu ((ban thanh) or (gia thanh)) vi ((su triet) or (ve triet))*.