Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh tung, thanh huong
thanh thuong » thanh huong, thanh chuong, thanh phuong
thong cong » trong cong, tong cong, thong thong
hien hach » thien hach, hien hanh, hien nhanh
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
chan cao » chan cho, chat cao, toan cao
chay cao » cay cao, chat cao, nha cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hach - ((thanh truong) OR (thanh thuong)) va thong cong dan ((chan cao) or (chay cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hach - ((thanh truong) OR (thanh thuong)) va thong cong dan ((chan cao) OR (chay cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hach - ((thanh truong) OR (thanh thuong)) va thong cong dan ((chan cao) or (chay cao))".
• Adding a wildcard symbol may retrieve word variants: hoc hien hach - ((thanh truong) OR (thanh thuong)) va thong cong dan ((chan cao) or (chay cao))*.