Perhaps you should try some spelling variations:
ve triet » va trien, su triet
ban hang » ngan hang
nang ma » tang ma, sang ma, mang may
hieu va » lieu va, hieu qua
cam vuc » cam xuc
vuc ban » vu ban, duc ban, cuc ban
co sach » bo sach, cuon sach, hoc sach
hang vi » hang va, hanh vi, hang di
su sach » so sach, vu sach
va cam » va cham, va cac, va cao
vi ve » va ve, gi ve, ve ve

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) or (co sach)) ty ((nang ma) or (nang cao)) hoi. hieu va cam vuc ban hang vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ty ((nang ma) OR (nang cao)) hoi. hieu va cam vuc ban hang vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ty ((nang ma) or (nang cao)) hoi. hieu va cam vuc ban hang vi ve triet*.