Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu vien » hieu hien, hieu viec, thieu nien
van triet » va triet, van thiet, van trieu
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
ty nang » ky nang, ty hang, ly nang
cac dac » cac dan, cac dai, cac bac
va hanh » va thanh, va danh, ban hanh
ve van » le van
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: thuoc sach ((ty nang) or (ty xang)) x hoi. hieu vien cac dac ((va hanh) OR (van hanh)) ve van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty nang) OR (ty xang)) x hoi. hieu vien cac dac ((va hanh) OR (van hanh)) ve van triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ty nang) or (ty xang)) x hoi. hieu vien cac dac ((va hanh) OR (van hanh)) ve van triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty nang) or (ty xang)) x hoi. hieu vien cac dac ((va hanh) OR (van hanh)) ve van triet*.