Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
gian cua » gian xu, ban cua
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, dang xay, lang van
cao tuc » dao tuc, cao duc, cao suc
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach tu) or (sach thieu)) lang xa hoi. lieu va cao tuc ((va hanh) or (van hanh)) gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (sach thieu)) lang xa hoi. lieu va cao tuc ((va hanh) OR (van hanh)) gian cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) or (sach thieu)) lang xa hoi. lieu va cao tuc ((va hanh) or (van hanh)) gian cua tre*.