Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
bo sach » co sach, hoc sach
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
ve chim » va chim, ve cham, ve chinh
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
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: bo sach y ((nang xa) or (lang xa)) hoi. hieu ((ve chim) or (va cham)) duc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve chim) OR (va cham)) duc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach y ((nang xa) or (lang xa)) hoi. hieu ((ve chim) or (va cham)) duc van hanh vi cua tre*.