Perhaps you should try some spelling variations:
ha thanh » va thanh, pham thanh, phan thanh
xa thanh » va thanh, ta thanh, gia thanh
sach tu » sach thu, sach ty, sach uu
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cach tu » cach thuc
co toc » cao toc, co hoc, co doc
va co » vo co

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

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