Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, chau tinh, kieu tinh
nhung cong » dung cong, thong cong, hang cong
lieu tinh » trieu tinh, diep tinh, bien tinh
sinh cua » manh cua, dinh cuu
cong san » cong tac
sinh va » sinh vat, tinh va, dinh van
san van » tan van, luan van, tran van

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

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