Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, sang ma, mang may
hieu va » lieu va, hieu qua
cam vuc » cam xuc
vuc van » duc van, luc van, thuc van
co sach » bo sach, cuon sach, hoc sach
hanh va » hang va, hanh vi
su sach » so sach, vu sach
va cam » va cham, va cac, va cao
va ve » va de, va le, va vi

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 van hanh va 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 van hanh va 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 van hanh va ve triet*.