Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
van danh » van doanh, van anh, van hanh
sach ky » sac ky, sach y, sach ty
danh va » doanh va, hanh va, anh va
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
ve chao » ve chat, ve cho, ve chang
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
xu van » tu van, vu van, su van
va va » va van, va vua, va vai

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 ky ((nang xa) OR (lang xa)) hoi. hieu ((ve chao) or (ve cham)) xu van danh va va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu ((ve chao) OR (ve cham)) xu van danh va va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (lang xa)) hoi. hieu ((ve chao) or (ve cham)) xu van danh va va thieu".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (lang xa)) hoi. hieu ((ve chao) or (ve cham)) xu van danh va va thieu*.