Perhaps you should try some spelling variations:
tuan tai » toan tai, quan tai, tan tai
van tuan » van quan, van ban, anh tuan
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
trai ky » thai ky
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
tai ky » thai ky, sai ky, dai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((tai ky) OR (trai ky)) tang xa hoi. hieu ve ((cam duc) or (pham duc)) van tuan tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((tai ky) OR (trai ky)) tang xa hoi. hieu ve ((cam duc) OR (pham duc)) van tuan tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((tai ky) OR (trai ky)) tang xa hoi. hieu ve ((cam duc) or (pham duc)) van tuan tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((tai ky) OR (trai ky)) tang xa hoi. hieu ve ((cam duc) or (pham duc)) van tuan tai cua tre*.