Perhaps you should try some spelling variations:
truong long » trong long, trung long, truong cong
chieu sang » chieu sach, chieu xanh, nhieu tang
dung quang » dung quan, luong quang, dung luan
dang quang » nang quan, dang hung
hieu lang » hieu quang, nhieu tang, hieu van
tac thanh » bac thanh, cac thanh, tcc thanh
thanh lap » thanh san, phan lap, thanh hai
long tac » cong tac, dong tac, luong tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (hieu lang)) - hanh ((dung quang) OR (dang quang)) truong long tac thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - hanh ((dung quang) OR (dang quang)) truong long tac thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (hieu lang)) - hanh ((dung quang) OR (dang quang)) truong long tac thanh lap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu lang)) - hanh ((dung quang) OR (dang quang)) truong long tac thanh lap*.