Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
dan may » dam may, dan tay, dat may
lai cua » dai cua, lai chau
hai cua » dai cua, hoi cua, hai quan
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu van cac dan may tinh ((((lai cua) OR (thai cua))) or (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu van cac dan may tinh ((((lai cua) OR (thai cua))) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu van cac dan may tinh ((((lai cua) OR (thai cua))) or (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu van cac dan may tinh ((((lai cua) OR (thai cua))) or (hai cua)) triet*.