Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
truong van » trong van, truong va, truong dai
nhung cong » dung cong, thong cong, hang cong
trung van » trong van, trung va, trung tuan
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 (thi thanh)) - thanh ((trung van) OR (truong van)) nhung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (thi thanh)) - thanh ((trung van) OR (truong van)) nhung cong dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (thi thanh)) - thanh ((trung van) OR (truong van)) nhung cong dan chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (thi thanh)) - thanh ((trung van) OR (truong van)) nhung cong dan chan cau*.