Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
tham thuc » nham thuc, pham thuc, tam thuc
doc sach » hoc sach, toc sach, dac sac
ty nang » ky nang, ty xang, ty hang
vi tham » vi pham, va tham, vi than
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
hieu vi » hieu voi, hieu va, hieu ve
nang o » nang co, nang ho, nang ro
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: ((doc sach) or (nuoc sach)) ty nang o hoi. hieu vi tham thuc va hanh ((vai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (nuoc sach)) ty nang o hoi. hieu vi tham thuc va hanh ((vai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (nuoc sach)) ty nang o hoi. hieu vi tham thuc va hanh ((vai cua) or (dai cua)) triet*.