Perhaps you should try some spelling variations:
ban thai » ban than, ban thi, ban tai
thai cua » than cua, tai cuc, tri cua
ky tang » ky dang, kho tang, ky trong
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can

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

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