Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
phuong van » phong van, phuong lan, phuong va
tuan doan » quan doan, tuan hoan, tan doan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (chieu sach)) - hanh trung tuan doan ((phuong van) OR (phung van)) bai tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (chieu sach)) - hanh trung tuan doan ((phuong van) OR (phung van)) bai tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (chieu sach)) - hanh trung tuan doan ((phuong van) OR (phung van)) bai tap".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (chieu sach)) - hanh trung tuan doan ((phuong van) OR (phung van)) bai tap*.