Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu tinh » trieu tinh, lieu tinh, chau tinh
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
san toan » van toan, dan toan, manh toan
toan ban » van ban
sinh va » sinh vat, tinh va, dinh van
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - canh ((anh va) or (sinh va)) ((nhung cong) OR (dung cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - canh ((anh va) OR (sinh va)) ((nhung cong) OR (dung cong)) san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - canh ((anh va) or (sinh va)) ((nhung cong) OR (dung cong)) san toan ban".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - canh ((anh va) or (sinh va)) ((nhung cong) OR (dung cong)) san toan ban*.