Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
va danh » va dinh, va dan, va hanh
cac tac » cac toc, cac bac, cac dac
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
cuu tre » cua tre, cau tren, cau treo
sanh y » sinh y, anh y, hanh y
tac va » tac da, tac xa, tuc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh y ((nang xa) or (sang ma)) hoi. hieu van cac tac va danh vai ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang xa) OR (sang ma)) hoi. hieu van cac tac va danh vai ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang xa) or (sang ma)) hoi. hieu van cac tac va danh vai ((cua te) or (cuu tre))*.