Perhaps you should try some spelling variations:
thien danh » thien anh, thien thanh, thien chanh
thien dang » thien bang, thien nang, thien cong
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
cua hang » cua dang, cua cong, cua ban
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 ((thien danh) or (thien dang)) - hanh tang ((cua hang) OR (cua nhung)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (thien dang)) - hanh tang ((cua hang) OR (cua nhung)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (thien dang)) - hanh tang ((cua hang) OR (cua nhung)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (thien dang)) - hanh tang ((cua hang) OR (cua nhung)) cong dan toan cau*.