Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
thai cua » than cua, tai cuc, tri cua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
van cac » van hac, van cau, van bac
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
cua te » cua tu
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: thu sach ((y nang) OR (ly nang)) x hoi. thien van cac nuoc ((va danh) or (va hanh)) thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ly nang)) x hoi. thien van cac nuoc ((va danh) OR (va hanh)) thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) OR (ly nang)) x hoi. thien van cac nuoc ((va danh) or (va hanh)) thai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) OR (ly nang)) x hoi. thien van cac nuoc ((va danh) or (va hanh)) thai cua te*.