Perhaps you should try some spelling variations:
vien dai » hien dai
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
loc van » luoc van, hoc van, lo van
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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: tu sac ky ((mang may) or (nang cao)) hoi. hieu ((ve cac) or (vien dai)) loc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((mang may) OR (nang cao)) hoi. hieu ((ve cac) OR (vien dai)) loc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((mang may) or (nang cao)) hoi. hieu ((ve cac) or (vien dai)) loc van hanh vi cua tre*.