Perhaps you should try some spelling variations:
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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 ky ((lang xa) or (dang xay)) hoi. lieu va cam tuc va ((hanh dai) OR (hanh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (dang xay)) hoi. lieu va cam tuc va ((hanh dai) OR (hanh dao)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) or (dang xay)) hoi. lieu va cam tuc va ((hanh dai) OR (hanh dao)) cua tre*".