Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
cong phan » cong nhan, cong khan, chong phap
phan cong » thanh cong
dang hanh » dang thanh, ban hanh, dang van
anh cong » hanh cong, anh dong, thanh cong
dung dat » dung va, dung tai
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 - anh cong phan cong ((dang hanh) OR (dung dat)) phan lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu hach - anh cong phan cong ((dang hanh) OR (dung dat)) phan lap".
• Adding a wildcard symbol may retrieve word variants: toc thieu hach - anh cong phan cong ((dang hanh) OR (dung dat)) phan lap*.