Perhaps you should try some spelling variations:
tai khoa » da khoa, noi khoa
bieu cua » dieu cua, hieu cua, ben cua
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang ((ma hoi) or (tai khoa)). bieu cua cac nuoc ((va dinh) or (va hanh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((ma hoi) OR (tai khoa)). bieu cua cac nuoc ((va dinh) OR (va hanh)) ca cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((ma hoi) or (tai khoa)). bieu cua cac nuoc ((va dinh) or (va hanh)) ca cua tre*.