Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hanh tai
hang hai » hoang hai, hang tai, thanh hai
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, lang xa, tang ha
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
su cac » tu cac, su cao, su can
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 cac ky ((tang xa) or (tang ma)) hoi. hieu ve cac duc ban ((hanh hai) or (hang hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky ((tang xa) OR (tang ma)) hoi. hieu ve cac duc ban ((hanh hai) OR (hang hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su cac ky ((tang xa) or (tang ma)) hoi. hieu ve cac duc ban ((hanh hai) or (hang hai)) cua tre*.