Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
dinh vi » dinh ve, dinh viet, dinh tri
su viet » so viet
va cam » va cham, va cac, va cao

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) OR (tang ma)) hoi. lieu va cam duc ban ((hanh vi) or (dinh vi)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang ma) OR (tang ma)) hoi. lieu va cam duc ban ((hanh vi) OR (dinh vi)) su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang ma) OR (tang ma)) hoi. lieu va cam duc ban ((hanh vi) or (dinh vi)) su viet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) OR (tang ma)) hoi. lieu va cam duc ban ((hanh vi) or (dinh vi)) su viet*.