Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
thanh tung » thanh cong
hoac khong » hoa khong, hay khong, hoa thong
doi chieu » doc hieu, doi chi, ho chieu
hoc khong » hoa khong, hoc hong, khoi khong
cang vat » dang vat, bang vat, hang va
van chat » cao chat
vat van » vat va, van van, vat ran

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu tinh - thanh tung ((hoac khong) or (hoc khong)) cang vat van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tinh - thanh tung ((hoac khong) OR (hoc khong)) cang vat van chat.
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - thanh tung ((hoac khong) or (hoc khong)) cang vat van chat*.