Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu xanh, hieu cach
chieu sang » chieu xanh, hieu lang, nhieu tang
tranh tuan » tran tuan, tranh luan, thanh tuan
tuan thong » toan thong, tran thong, tuan phong
thong tan » thong than, thong tran, thong tin
tran cao » toan cao, tran chau, trang cho

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 sach) or (chieu sang))) or (chiet tach)) - canh tranh tuan thong thong tan tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((chieu sach) OR (chieu sang))) OR (chiet tach)) - canh tranh tuan thong thong tan tran cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((((chieu sach) or (chieu sang))) or (chiet tach)) - canh tranh tuan thong thong tan tran cao*.