Perhaps you should try some spelling variations:
dai thao » thi thao, dai han
hanh hai » thanh hai, nhanh hai, hang hai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai moi
hai cua » thai cua, dai cua, hoi cua
dai hai » dai han, dai tai, dai nhat
va hanh » van hanh, va thanh, va danh
su sac » su sach, su cac, su xac
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
cua te » cua tu

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 ((dai hoi) or (((dai hai) or (dai thao)))). hieu ve cac nuoc va hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((dai hoi) OR (((dai hai) OR (dai thao)))). hieu ve cac nuoc va hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((dai hoi) or (((dai hai) or (dai thao)))). hieu ve cac nuoc va hanh hai cua te*.