Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tang tai » hang tai, dung tai, sang tao
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang cao) or (tang tai)) roi. hieu ((ve cam) OR (va cam)) duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang cao) OR (tang tai)) roi. hieu ((ve cam) OR (va cam)) duc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang cao) or (tang tai)) roi. hieu ((ve cam) OR (va cam)) duc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang cao) or (tang tai)) roi. hieu ((ve cam) OR (va cam)) duc va hanh vai cua tre*.