Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh mai » thanh hai, thanh tai, thanh moi
tang mai » tang ma, tang tai, lang mai
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, va cam
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky tang mai hoi. hieu ve cam ((luc van) or (duc van)) thanh mai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky tang mai hoi. hieu ve cam ((luc van) OR (duc van)) thanh mai va thiet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky tang mai hoi. hieu ve cam ((luc van) or (duc van)) thanh mai va thiet*.