Perhaps you should try some spelling variations:
dan khai » dang khai, van khai, dang khoi
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dan hai » doan hai, dang hai, van hai
tu ban » thu ban, te ban
ban ky » van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky dang ma hoi. hieu ve cham ((tuc va) or (tuc xa)) ((dan hai) OR (dan khai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky dang ma hoi. hieu ve cham ((tuc va) OR (tuc xa)) ((dan hai) OR (dan khai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky dang ma hoi. hieu ve cham ((tuc va) or (tuc xa)) ((dan hai) OR (dan khai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ban ky dang ma hoi. hieu ve cham ((tuc va) or (tuc xa)) ((dan hai) OR (dan khai)) cua tre*.