Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
cong gian » chong gian, con gian, cong giao
gian dan » gian lang
dan dong » van dong, dan dung, dao dong
dong dan » dong danh, duong dan, dong san
phan van » pham van, thanh van, luan van
phan lap » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu hach - thanh cong gian dan dong dan ((phan van) OR (phan lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu hach - thanh cong gian dan dong dan ((phan van) OR (phan lap))*".