Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
doanh va » doan va, doanh tai, doanh cua
bo sach » co sach, hoc sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ((ty nang) OR (ty hang)) x ho. hieu ve pham duc va doanh va ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ((ty nang) OR (ty hang)) x ho. hieu ve pham duc va doanh va ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ((ty nang) OR (ty hang)) x ho. hieu ve pham duc va doanh va ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: bo sach ((ty nang) OR (ty hang)) x ho. hieu ve pham duc va doanh va ((cua te) or (cua tu))*.