Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
toc sach » hoc sach, doc sach, thuoc sach
hieu vi » hieu voi, hieu va, hieu ve
sach ty » sach y, sach tu, sach thu
chuc va » thuc va, thuc vat
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, ma hoa, me hoi
hai su » hai vu, lai su, tai su
hai so » dai so, tai so, thai son

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((ma hoi) OR (xa hoi)). hieu vi pham chuc va hanh ((hai su) OR (hai so)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ((ma hoi) or (xa hoi)). hieu vi pham chuc va hanh ((hai su) OR (hai so)) triet~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ((ma hoi) or (xa hoi)). hieu vi pham chuc va hanh ((hai su) OR (hai so)) triet*.