Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hanh hai » thanh hai, hang hai, hanh tai
dai hai » dai hoi, dai tai, dai thao
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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