Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, mang may
va cao » va cac, va co, va dao
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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 ((nang ma) or (nang cao)) hoi. hieu ((ve cam) or (va cao)) thuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang ma) OR (nang cao)) hoi. hieu ((ve cam) OR (va cao)) thuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang ma) or (nang cao)) hoi. hieu ((ve cam) or (va cao)) thuc van hanh vi cua tre*.