Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
thanh lai » thanh hai, thanh lap, thanh tai
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
luc va » duc va, tuc va, loc va
co loi » co hoi
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: su ((sach ty) or (sach y)) nang co loi. hieu va cam luc va ((thanh lai) OR (thanh loi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang co loi. hieu va cam luc va ((thanh lai) OR (thanh loi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang co loi. hieu va cam luc va ((thanh lai) OR (thanh loi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang co loi. hieu va cam luc va ((thanh lai) OR (thanh loi)) cua tre*.