Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
thien hach » hien hanh
trung va » truong va, trang va, trung ha
va trong » va truong, va thong, va tuong
cong dan » cong san, cong tan, huong dan
dan thai » dang thai, dan thi, dan than
thai cao » tai cao, thoai cac, thuat 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 ((thien hach) OR (thien thanh)) - thanh trung va trong cong dan thai cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) OR (thien thanh)) - thanh trung va trong cong dan thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) OR (thien thanh)) - thanh trung va trong cong dan thai cao*.