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
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua cu, cua te
cua su » qua su
o hoi » co hoi, o hoc, o hai

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