Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
hac tuc » thac toc, thai tuc
tuc van » thuc van, truc van, tuc va
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va hac » van hac, va khac, va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) or (sac ky)) nang ma hoi. lieu va hac tuc van hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sac ky)) nang ma hoi. lieu va hac tuc van hanh hai cua tre*.