Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
canh hanh » xanh hanh, danh thanh, van hanh
cong vang » cong lang, cong quang, cong ngang
vang phan » van phan, nang phan, quang phan
ban hanh » ban hang
va trong » va truong, va thong, va tuong
phan dau » phan tu, hang dau

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