Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chiet tach » chieu sach
hanh nhung » anh nhung, canh nhung, doanh nhung
nhung lao » nhung lan, nhung lang, khuong lao
dong cong » duong cong, dung cong, dang cong
lao dong » ha dong, van dong
dan phan » doan phan, van phan, dam phan
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (chiet tach)) - hanh nhung lao dong cong ((dan phan) OR (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (chiet tach)) - hanh nhung lao dong cong ((dan phan) OR (dan chan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (chiet tach)) - hanh nhung lao dong cong ((dan phan) OR (dan chan)) cau*".