Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
manh tung » manh hung, thanh tung
dap nhung » vap nhung, va nhung, dap ung
tung dap » tung dan, trung dai, tuong dan
cong san » cong tac
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 ((chieu sang) or (chiet tach)) - manh tung dap nhung ((cong san) or (cong ty)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - manh tung dap nhung ((cong san) OR (cong ty)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chiet tach)) - manh tung dap nhung ((cong san) or (cong ty)) toan cau*.