Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va nam » van nam, ha nam, va nay
y nang » ky nang, ly nang, v nang
tu cua » hu cua, vu cua
tu ca » tu cac, tu can, tu cay
va ve » va de, va le, va vo
va vi » ba vi

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

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