Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
ban bo » can bo, ban do, ban co
bo van » vo van, so van, do van
va ban » van ban, va bai, va bao

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 ky) or (sach ty)) nang x ho. hieu va ban bo van hanh vi ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x ho. hieu va ban bo van hanh vi ((va triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang x ho. hieu va ban bo van hanh vi ((va triet) or (ve triet))*.