Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
truong cao » truong dai
cong thanh » dong thanh, cong trinh, cong tan
thanh chan » thanh phan, thanh nhan, thanh cha
hien hach » thien hach, hien nhanh, hien khanh
hien hanh » dieu hanh
truong va » truong dai, truong dao, luong va
chan cao » chan cho, chat cao, chay 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) or (hien hanh)) - thanh ((truong va) OR (truong cao)) phuong cong thanh chan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hach) OR (hien hanh)) - thanh ((truong va) OR (truong cao)) phuong cong thanh chan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hach) or (hien hanh)) - thanh ((truong va) OR (truong cao)) phuong cong thanh chan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hach) or (hien hanh)) - thanh ((truong va) OR (truong cao)) phuong cong thanh chan cao*.