Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
so viet » hoc viet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
sach v » sach va, sach 2, sach vay

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