Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
xuc van » duc van, luc van, vuc van
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
vu cham » vu kham, tu cham, qua cham
hai va » hai van, thai va, hoi va
ma hoi » mai hoi, xa hoi, ma hoa
bi va » bo va
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: tu sach ky tang ma hoi. hieu ((va cham) or (vu cham)) xuc van hanh ((bi va) or (hai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ma hoi. hieu ((va cham) OR (vu cham)) xuc van hanh ((bi va) OR (hai va)) thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ma hoi. hieu ((va cham) or (vu cham)) xuc van hanh ((bi va) or (hai va)) thiet*.