Perhaps you should try some spelling variations:
thien hieu » thien nhien, thien chien, thien hue
hanh tranh » hanh trinh, hanh trang, lanh tranh
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua khong, cua tong
cong van » cong vang, cong san, song van
than tap » han tap, phan tap, than cap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: thien hieu lang - ((hanh tranh) or (canh tranh)) cua thong cong van ((than tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien hieu lang - ((hanh tranh) OR (canh tranh)) cua thong cong van ((than tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien hieu lang - ((hanh tranh) or (canh tranh)) cua thong cong van ((than tap) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: thien hieu lang - ((hanh tranh) or (canh tranh)) cua thong cong van ((than tap) OR (toan tap))*.