Perhaps you should try some spelling variations:
xuyen tai » xuyen tac, nguyen tai, truyen tai
cach thuc » anh thuc, cac thu
toan dang » tran dang, toan mang, toan tang
dang cong » dung cong
ly toan » le toan, ly hoan, ly tran
ban ve » ban va
ve ly » ve ky, ve li, ve y
tuyen » truyen, quyen

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tuyen tap) or (xuyen tai)) cach thuc đe co ban ve ly toan dang cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tuyen tap) OR (xuyen tai)) cach thuc đe co ban ve ly toan dang cong.
• Adding a wildcard symbol may retrieve word variants: ((tuyen tap) or (xuyen tai)) cach thuc đe co ban ve ly toan dang cong*.