Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van 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 ((chieu xanh) or (((hieu lang) OR (hieu quang)))) - hanh trung va nhung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (((hieu lang) OR (hieu quang)))) - hanh trung va nhung cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (((hieu lang) OR (hieu quang)))) - hanh trung va nhung cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (((hieu lang) OR (hieu quang)))) - hanh trung va nhung cong tan toan ban*.