Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, hien hanh
thien dang » thien bang, thien danh, thien nang
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
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 chanh) or (thien dang)) - hanh tang luan ((dang cong) OR (dung cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien chanh) OR (thien dang)) - hanh tang luan ((dang cong) OR (dung cong)) manh toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien chanh) or (thien dang)) - hanh tang luan ((dang cong) OR (dung cong)) manh toan cao*".