Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
canh trang » canh tranh, hanh trang, banh trang
trang vat » trang va, trang vai, tang vat
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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) or (chieu sang)) - canh trang vat ((dung cong) OR (dung trong)) dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - canh trang vat ((dung cong) OR (dung trong)) dan than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sang)) - canh trang vat ((dung cong) OR (dung trong)) dan than ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - canh trang vat ((dung cong) OR (dung trong)) dan than ban*.