Perhaps you should try some spelling variations:
van danh » van doanh, van anh, van manh
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
ve chao » ve chat, ve cham, ve chang
sach ty » sach y, sach tu, sach thu
ma hoi » mai hoi, xa hoi, ma hoa
ve cho » ve co, ve che, de cho
va va » va van, va vua, va vai
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: su sach ty nang ma hoi. hieu ((ve chao) or (ve cho)) xu ((van danh) or (van hanh)) va va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu ((ve chao) OR (ve cho)) xu ((van danh) OR (van hanh)) va va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ((ve chao) or (ve cho)) xu ((van danh) or (van hanh)) va va thiet*.