Perhaps you should try some spelling variations:
trong tuan » trung tuan, trong tan, trang tuan
trong quan » thong quan, tong quan, thong quang
nhung cong » dung cong, thong cong, hang cong
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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) or (ho chieu)) sach - hanh ((trong tuan) OR (trong quan)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (ho chieu)) sach - hanh ((trong tuan) OR (trong quan)) nhung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (ho chieu)) sach - hanh ((trong tuan) OR (trong quan)) nhung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (ho chieu)) sach - hanh ((trong tuan) OR (trong quan)) nhung cong dan toan cau*.