Perhaps you should try some spelling variations:
phuong thong » phuong trong, thong thong, phuong hoang
hanh trang » thanh trung, canh tranh, minh trang
chieu sang » chieu sach, chieu xanh, nhieu tang
hanh trinh » canh tranh, hanh chinh
thong doan » thong dan, trong doanh, thong hoang
hieu lang » hieu quang, nhieu tang, hieu van
va phuong » va thuong, cac phuong
doan van » doan va, hoang van, luan 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 (hieu lang)) - ((hanh trang) or (hanh trinh)) va phuong thong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - ((hanh trang) OR (hanh trinh)) va phuong thong doan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - ((hanh trang) or (hanh trinh)) va phuong thong doan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - ((hanh trang) or (hanh trinh)) va phuong thong doan van ban*.