Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh han, chinh tai
thu sach » tu sach, thuat sach, thuoc sach
trinh tu » trinh ky, trinh do
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
xuc va » duc va, tuc va, luc va
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: thu sach tu ((hang va) or (lang xa)) hoi. hieu va cam xuc va ((trinh tai) OR (trinh tu)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((hang va) OR (lang xa)) hoi. hieu va cam xuc va ((trinh tai) OR (trinh tu)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu ((hang va) or (lang xa)) hoi. hieu va cam xuc va ((trinh tai) OR (trinh tu)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach tu ((hang va) or (lang xa)) hoi. hieu va cam xuc va ((trinh tai) OR (trinh tu)) cua tre*.