Perhaps you should try some spelling variations:
hanh tranh » hanh trinh, hanh trang, lanh tranh
chieu sang » chieu sach, chieu xanh, nhieu tang
nung phong » nhung phong, rung phong, dung phong
hieu lang » hieu quang, nhieu tang, hieu van
phong van » phung van, thong van, phong va
cua nung » cua nhung, ca nung, cua nong
van tuan » van quan, van ban, anh tuan
tuan cao » toan cao, juan cao, quang cao

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 tranh) or (canh tranh)) cua nung phong van tuan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - ((hanh tranh) OR (canh tranh)) cua nung phong van tuan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - ((hanh tranh) or (canh tranh)) cua nung phong van tuan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - ((hanh tranh) or (canh tranh)) cua nung phong van tuan cao*.