Perhaps you should try some spelling variations:
nguyen tac » nguyen thi, nguyen van, nguyen duc
xuyen tai » xuyen tac, nguyen tai, truyen tai
tien dung » tin dung, tieu dung, tien hung
dung cong » dung trong
cac che » cac he, cac chien, cac chat
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 tac) or (xuyen tai)) cac che đe co ban ((ve y) or (ke y)) tien dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nguyen tac) OR (xuyen tai)) cac che đe co ban ((ve y) OR (ke y)) tien dung cong.
• Adding a wildcard symbol may retrieve word variants: ((nguyen tac) or (xuyen tai)) cac che đe co ban ((ve y) or (ke y)) tien dung cong*.