Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
duc ban » duc van, dua ban, duc man
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sac ky » cac ky
ve cam » ve cham, ve cac, va cam

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) or (sai ky)) lang xa hoi. hieu ve cam ((duc ban) or (duc tan)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) lang xa hoi. hieu ve cam ((duc ban) OR (duc tan)) hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sai ky)) lang xa hoi. hieu ve cam ((duc ban) or (duc tan)) hanh hai cua tre*.