Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
vien cac » vien bach, vien da, gian cac
vien dai » hien dai
kho tang » cao tang
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
su cao » cu cao, vu cao, su co

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cao ((ky tang) OR (kho tang)) ma hoi. hieu ((vien cac) or (vien dai)) duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cao ((ky tang) OR (kho tang)) ma hoi. hieu ((vien cac) OR (vien dai)) duc ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cao ((ky tang) OR (kho tang)) ma hoi. hieu ((vien cac) or (vien dai)) duc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su cao ((ky tang) OR (kho tang)) ma hoi. hieu ((vien cac) or (vien dai)) duc ban thanh dai cua tre*.