Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
kim ngan » kim ngoc
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
toan cao » toan ban, toan tap
hoc kim » hoc ki, nhuoc kim, hoc kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc kim ngan - ((hanh manh) or (hanh trinh)) cua nhung ((cong van) OR (song van)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kim ngan - ((hanh manh) OR (hanh trinh)) cua nhung ((cong van) OR (song van)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kim ngan - ((hanh manh) or (hanh trinh)) cua nhung ((cong van) OR (song van)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc kim ngan - ((hanh manh) or (hanh trinh)) cua nhung ((cong van) OR (song van)) toan cao*.