Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
trung tuan » trung thanh, trung tam, tran tuan
tong thong » thong thong, dong thong, cong thong
trung cua » truong cua, trung cap, dung cua
thong tap » thong cap, tong tap, thong tai
tap quan » tac quan, hai quan
quan ban » quang ban, qua ban, quan van

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 sang) or (chieu xanh)) - hanh ((trung cua) OR (trung tuan)) tong thong tap quan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu xanh)) - hanh ((trung cua) OR (trung tuan)) tong thong tap quan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu xanh)) - hanh ((trung cua) OR (trung tuan)) tong thong tap quan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu xanh)) - hanh ((trung cua) OR (trung tuan)) tong thong tap quan ban*.