Perhaps you should try some spelling variations:
xuyen tai » nguyen tai, truyen tai, luyen thi
xuyen tac » nguyen tac, thuyen tac, tuyen tap
cong cong » cong dong, trong cong, dung cong
va thuat » ky thuat, ki thuat, va thuc
thi cong » tai cong, thien cong
cac che » cac he, cac chien, cac chat
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) OR (xuyen tac)) ((ca cua) or (((cac che) or (va thuat)))) đe co ban le y thi cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((xuyen tai) OR (xuyen tac)) ((ca cua) OR (((cac che) OR (va thuat)))) đe co ban le y thi cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((xuyen tai) OR (xuyen tac)) ((ca cua) or (((cac che) or (va thuat)))) đe co ban le y thi cong cong".
• Adding a wildcard symbol may retrieve word variants: ((xuyen tai) OR (xuyen tac)) ((ca cua) or (((cac che) or (va thuat)))) đe co ban le y thi cong cong*.