Perhaps you should try some spelling variations:
quan truong » quang truong, quan trong, xuan truong
manh trung » manh tung, thanh trung, manh hung
thien danh » thien anh, thien dang, thien thanh
trung quan » truong quan, trong quan, trung tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
dong thap » dong tham, dong thanh, dong thuan
dong tap » dong tai, tong tap, dong tam
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 ((thien danh) or (hieu manh)) - manh trung quan truong ((dong tap) OR (dong thap)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (hieu manh)) - manh trung quan truong ((dong tap) OR (dong thap)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (hieu manh)) - manh trung quan truong ((dong tap) OR (dong thap)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (hieu manh)) - manh trung quan truong ((dong tap) OR (dong thap)) toan cao*.