Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
hoa lang » hoa dan, hoa van
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan dau » phan tu, hang dau
va nang » van nang, da nang, cam nang

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