Perhaps you should try some spelling variations:
cac thuat » va thuat, hoc thuat, cac thu
xuyen tai » xuyen tac, nguyen tai, truyen tai
cong cong » cong dong, trong cong, dung cong
cac chu » cac thu, cac khu, ca chu
cac che » cac chien, cac chat, sach che
ban le » ban ve
ky tai » ly tai, ky thi, kg tai
le ky » ke ky, ve ky, ly ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: xuyen tai ((cac chu) or (((((cac che) OR (cac he))) or (cac thuat)))) đe co ban le ky tai cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: xuyen tai ((cac chu) OR (((((cac che) OR (cac he))) OR (cac thuat)))) đe co ban le ky tai cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "xuyen tai ((cac chu) or (((((cac che) OR (cac he))) or (cac thuat)))) đe co ban le ky tai cong cong".
• Adding a wildcard symbol may retrieve word variants: xuyen tai ((cac chu) or (((((cac che) OR (cac he))) or (cac thuat)))) đe co ban le ky tai cong cong*.