Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien thanh » thien thanh, hien hanh, tien thanh
khong cong » thong cong, khong cang, khong con
chong cong » cong cong, thong cong, cuong cong
den thanh » de thanh, dinh thanh, dong thanh
trung cua » truong cua, trung tuan, trung cap
san hanh » san thanh, ban hanh, van hanh
hanh cap » hanh cac, hanh cat, hanh cad

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 thanh) or (den thanh)) - thanh trung cua ((khong cong) OR (chong cong)) san hanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien thanh) OR (den thanh)) - thanh trung cua ((khong cong) OR (chong cong)) san hanh cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien thanh) or (den thanh)) - thanh trung cua ((khong cong) OR (chong cong)) san hanh cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien thanh) or (den thanh)) - thanh trung cua ((khong cong) OR (chong cong)) san hanh cap*.