Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
ban cong » bang cong, van cong, phan cong
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca
van chat » cao chat

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - canh tranh cua ban cong ((dan than) OR (((dan chan) OR (van chat)))) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - canh tranh cua ban cong ((dan than) OR (((dan chan) OR (van chat)))) cao*.