Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hoc sach » hoc sinh, hoc cac, hoc anh
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
tuc va » truc va, tuc xa, duc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty xang xa hoi. hieu va phat ((tuc va) or (thuc va)) thanh doi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty xang xa hoi. hieu va phat ((tuc va) OR (thuc va)) thanh doi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty xang xa hoi. hieu va phat ((tuc va) or (thuc va)) thanh doi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty xang xa hoi. hieu va phat ((tuc va) or (thuc va)) thanh doi ((cua te) OR (cua tu))*.