Perhaps you should try some spelling variations:
phat duc » pham duc, phan duc, phan duoc
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
va dinh » van dinh, va kinh, va tinh
tai cua » thai cua, tai cuc, tri cua
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang ((o hoi) OR (co hoi)). lieu va phat duc ((va hanh) or (va dinh)) tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ((o hoi) OR (co hoi)). lieu va phat duc ((va hanh) OR (va dinh)) tai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ((o hoi) OR (co hoi)). lieu va phat duc ((va hanh) or (va dinh)) tai cua te*".