Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
sach ky » sach y, sach ty, sach kem
van anh » van thanh, tuan anh, van minh
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
te cua » tue cua, le cua, de cua
ve cau » ke cau, va cau, ve 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 (sac ky)) nang xa hoi. hieu ve cau luc ((van hanh) or (van anh)) te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cau luc ((van hanh) OR (van anh)) te cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cau luc ((van hanh) or (van anh)) te cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cau luc ((van hanh) or (van anh)) te cua tre*.