Perhaps you should try some spelling variations:
qua giao » cua giao, qua gia, qua giai
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, dang xay
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 ty ((mang xa) or (nang x)) hoi. hieu qua giao duc va thanh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((mang xa) OR (nang x)) hoi. hieu qua giao duc va thanh va ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((mang xa) or (nang x)) hoi. hieu qua giao duc va thanh va ((cua tre) or (cua te))*.