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