Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
te cua » tue cua, le cua, de cua

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 nang ((mai hoi) or (ma hoa)). hieu ve cau luc ((van hanh) or (van minh)) te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai hoi) OR (ma hoa)). hieu ve cau luc ((van hanh) OR (van minh)) te cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai hoi) or (ma hoa)). hieu ve cau luc ((van hanh) or (van minh)) te cua tre*.