Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
van chat » cao chat
chat tuc » chat xuc, luat tuc, chat huu
thu sach » thuat sach, thuoc sach, thu hoach
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren
tu sach » su sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
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)) y nang xa hoi. hieu van chat tuc va thanh doi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van chat tuc va thanh doi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang xa hoi. hieu van chat tuc va thanh doi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang xa hoi. hieu van chat tuc va thanh doi ((cuu tre) OR (cau treo))*.