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
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
ve cam » ve cham, ve cac, va cam
su sac » su sach, su cac, su xac

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) OR (ky dang)) xa hoi. hieu ve cam duc ban ((hanh tai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve cam duc ban ((hanh tai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve cam duc ban ((hanh tai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve cam duc ban ((hanh tai) or (thanh tai)) cua tre*.