Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
cua dao » ca dao, cua dan, cua dai
thu cua » thuc cua, hu cua, tu cua
cac thu » cach thuc, cac thoi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ro » nang co, nang ra, nang rong
nang ho » nang hoc, nang co, tang ho
ve cac » va cac, vien cac
dao ve » bao ve, dap ve, dau ve
ve cua » le cua, de cua, te cua

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) or (sach y)) ((nang ho) or (nang ro)) hoi. hieu ve cac thu cua dao ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) ((nang ho) OR (nang ro)) hoi. hieu ve cac thu cua dao ve cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) ((nang ho) or (nang ro)) hoi. hieu ve cac thu cua dao ve cua tre*.