Perhaps you should try some spelling variations:
cap nuoc » dat nuoc
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
va cap » va cac, va dap, va cao
di cua » doi cua, de cua, do cua

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) or (co sach)) ty lang xa hoi. hieu va cap nuoc va danh ((di cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty lang xa hoi. hieu va cap nuoc va danh ((di cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) ty lang xa hoi. hieu va cap nuoc va danh ((di cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ty lang xa hoi. hieu va cap nuoc va danh ((di cua) OR (dai cua)) te*.