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

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) OR (duc tan)) thanh vi su 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) OR (duc tan)) thanh vi su 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) OR (duc tan)) thanh vi su viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) or (sach y)) nang ma hoi. lieu va cam ((duc ban) OR (duc tan)) thanh vi su viet*.