Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
trung dap » trung cap, trung dai, trung dam
dap nhung » vap nhung, va nhung, dap ung
cong san » cong tac
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh trung dap nhung cong san ((((toan cao) OR (toan tap))) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh trung dap nhung cong san ((((toan cao) OR (toan tap))) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh trung dap nhung cong san ((((toan cao) OR (toan tap))) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh trung dap nhung cong san ((((toan cao) OR (toan tap))) or (toan ban))*.