Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
cac luc » cau luc, coc luc, cac nuoc
sach ly » sach y, sach lo, sach hay
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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 ly) or (sach ty)) nang xa hoi. hieu ve cac luc ((va hanh) or (van hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ly) OR (sach ty)) nang xa hoi. hieu ve cac luc ((va hanh) OR (van hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ly) or (sach ty)) nang xa hoi. hieu ve cac luc ((va hanh) or (van hanh)) vi cua tre*.