Perhaps you should try some spelling variations:
nguyen tai » nguyen thai, nguyen thi, nguyen tac
truyen tai » truyen dai, truyen bai, truyen tam
dung cong » dung trong
xuyen tai » xuyen tac, luyen thi, tuyen tap
cac che » cac he, cac chien, cac chat
te dung » tieu dung, tien dung, tin dung
ve y » ve ky, ve _, te y
ke y » ke ky, ke o

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

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