Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
doc sach » hoc sach, toc sach, nuoc sach
ty nang » ty xang, ty hang, ly nang
hieu vi » hieu voi, hieu va, hieu ve
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
x hoi » xa hoi, o hoi, x ho

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 ((ty nang) OR (ky nang)) x 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 ((ty nang) OR (ky nang)) x hoi. hieu vi tham thuc va hanh ((vai cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ty nang) OR (ky nang)) x hoi. hieu vi tham thuc va hanh ((vai cua) or (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: doc sach ((ty nang) OR (ky nang)) x hoi. hieu vi tham thuc va hanh ((vai cua) or (dai cua)) triet*.