Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
tranh he » trinh he, tranh ha, tinh he
he trong » he thong, he trung, le trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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