Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
via cua » gia cua, gian cua, giau cua
cac lop » cac hop, cac loai
hieu ve » hieu va, hieu van
ty nang » ky nang, ty hang, ly nang
lop va » lap va, hop va, nop va
ca cua » co cua
ve cac » va cac, vien cac

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 ((ty nang) or (ty xang)) xa hoi. hieu ve cac lop va doanh ((ca cua) or (via cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cac lop va doanh ((ca cua) OR (via cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) xa hoi. hieu ve cac lop va doanh ((ca cua) or (via cua)) tre*.