Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
nang ro » nang co, nang ho, nang ra
ro hai » co hai, o hai, so hai
ve cac » va cac, vien cac

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 ky) or (sach y)) nang ro hai. hieu ve cac duc ((van hanh) OR (ban hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ro hai. hieu ve cac duc ((van hanh) OR (ban hanh)) thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ro hai. hieu ve cac duc ((van hanh) OR (ban hanh)) thai cua tre*".