Perhaps you should try some spelling variations:
phuong thong » phuong trong, phuong hoang, phuong dong
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trang » thanh trung, canh tranh, hanh trinh
trang va » tran van, hang va
den than » den thanh, dien than, dan than
than cau » toan cau, phan cau, than cap

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)) - hanh trang va ((phuong thong) OR (thong thong)) den than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh trang va ((phuong thong) OR (thong thong)) den than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - hanh trang va ((phuong thong) OR (thong thong)) den than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - hanh trang va ((phuong thong) OR (thong thong)) den than cau*.