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