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 va » lieu va, hieu qua
va pham » van pham, va phat, va phap
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 va 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 va 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 va pham duc va doanh va ((cua te) or (cua tu))*.