Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trung dap » trung cap, trung dai, trung dam
dap nhung » vap nhung, va nhung, dap ung
cong san » cong tac
than cau » toan cau, phan cau, than cap
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - thanh trung dap nhung ((cong san) or (huong dan)) ((than cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung dap nhung ((cong san) OR (huong dan)) ((than cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung dap nhung ((cong san) or (huong dan)) ((than cau) or (toan tap))*.