Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh tranh » hanh trinh, hanh trang, lanh tranh
khong cong » thong cong, chong cong, khong con
khong cang » thong cong, hong bang, khong dung
hoc thien » hoc hien, hoc thieu, hoc thiet
dan thanh » dang thanh, danh thanh, ban thanh
thanh ban » thanh san, thanh van, thanh bac

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 - ((hanh tranh) OR (canh tranh)) cua ((khong cong) or (khong cang)) dan thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - ((hanh tranh) OR (canh tranh)) cua ((khong cong) OR (khong cang)) dan thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - ((hanh tranh) OR (canh tranh)) cua ((khong cong) or (khong cang)) dan thanh ban".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - ((hanh tranh) OR (canh tranh)) cua ((khong cong) or (khong cang)) dan thanh ban*.