Perhaps you should try some spelling variations:
toan thanh » tran thanh, hoan thanh, toan thang
khoa tang » kho tang, khoa dang, khoa tieng
thanh ban » thanh san, thanh van, thanh bac
dac khoa » da khoa, dai khoa, dau khoa
duc toan » duc tan, duc ton, duc hoan
cua tre » cua te, cua triet, dua tren
tang xa » trang xa, tang ma, lang xa
cuu tre » cau tren, cau treo
su dac » so dac, su dai, su cac
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dac khoa tang xa hoi. hieu ((ve cam) or (va cam)) duc toan thanh ban ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dac khoa tang xa hoi. hieu ((ve cam) OR (va cam)) duc toan thanh ban ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su dac khoa tang xa hoi. hieu ((ve cam) or (va cam)) duc toan thanh ban ((cuu tre) or (cua tre))*.