Perhaps you should try some spelling variations:
kho tang » cao tang
quan hai » quan ha, qua hai, quan tai
tuan hai » tuan khai, tran hai, tuan tai
duc tran » duc tan, duc toan, duc tren
cua tre » cua te, cuu tre, cua triet
vu cham » va cham, vu kham, tu cham
cac kho » cac khoi, cac khoa, cac khu
ve cham » va cham, ve chat, ve chim
tang xa » trang xa, tang ma, lang xa
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 kho tang xa hoi. hieu ((ve cham) or (vu cham)) duc tran ((tuan hai) OR (quan hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac kho tang xa hoi. hieu ((ve cham) OR (vu cham)) duc tran ((tuan hai) OR (quan hai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac kho tang xa hoi. hieu ((ve cham) or (vu cham)) duc tran ((tuan hai) OR (quan hai)) cua tre*".