Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
phat tuc » phan tu, luat tuc, pham tu
va chinh » tai chinh, te chinh
tu sach » su sach, te sach, tu cach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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) OR (thu sach)) ty ((nang xa) or (nang x)) hoi. hieu va phat tuc va chinh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty ((nang xa) OR (nang x)) hoi. hieu va phat tuc va chinh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty ((nang xa) or (nang x)) hoi. hieu va phat tuc va chinh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty ((nang xa) or (nang x)) hoi. hieu va phat tuc va chinh tri cua tre*.