Perhaps you should try some spelling variations:
tai khoa » da khoa, noi khoa
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, vuc van
va chat » van chat, va phat, hoa chat
lang ha » long ha
dang ha » dong ha, dung ha, tang ha
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu tai khoa ((dang ha) or (lang ha)) hoi. hieu ((va chat) or (cao chat)) xuc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu tai khoa ((dang ha) OR (lang ha)) hoi. hieu ((va chat) OR (cao chat)) xuc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu tai khoa ((dang ha) or (lang ha)) hoi. hieu ((va chat) or (cao chat)) xuc van hanh vai cua tre*.