Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
lang ha » long ha
tang ma » mang may, tang van
ve cac » va cac, vien cac
te san » te ban, ke san, tu san
vi cua » vai cua, di cua
te sac » te sach, te 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 sac) or (te san)) ky ((tang ma) or (lang ha)) hoi. hieu ve cac duc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky ((tang ma) OR (lang ha)) hoi. hieu ve cac duc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te san)) ky ((tang ma) or (lang ha)) hoi. hieu ve cac duc van hanh vi cua tre*.