Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hanh tai » hang tai, han tai, hinh tai
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
su sac » su sach, su cac, su xac
ve cac » va cac, vien cac
sac ky » cac ky, sai 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 sac ky tang xa hoi. hieu ve cac ((duc ban) OR (duc van)) ((hanh tai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. hieu ve cac ((duc ban) OR (duc van)) ((hanh tai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. hieu ve cac ((duc ban) OR (duc van)) ((hanh tai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu ve cac ((duc ban) OR (duc van)) ((hanh tai) or (thanh tai)) cua tre*.