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 chat » cao chat, cac nha, van chat
thi cong » tai cong, thien cong
cac che » cac he, cac chien, sach che
ca cua » co cua
ban le » ban ve
y thi » ky thi, y thai, ly thi
le y » le ky, le sy, ly y

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 ((ca cua) or (((((cac che) OR (cac chat))) or (cac thuat)))) đe co ban le y thi cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: xuyen tai ((ca cua) OR (((((cac che) OR (cac chat))) OR (cac thuat)))) đe co ban le y thi cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "xuyen tai ((ca cua) or (((((cac che) OR (cac chat))) or (cac thuat)))) đe co ban le y thi cong cong".
• Adding a wildcard symbol may retrieve word variants: xuyen tai ((ca cua) or (((((cac che) OR (cac chat))) or (cac thuat)))) đe co ban le y thi cong cong*.