Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hanh tinh » hanh trinh, thanh tinh, canh tinh
hang cong » dang cong, hang nong, bang cong
kim ngan » kim ngoc
hoc kim » hoc ki, nhuoc kim, hoc kinh
san van » tan van, luan van, tran 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 kim ngan - ((hanh tinh) OR (nhanh tinh)) cua ((thong cong) or (hang cong)) san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kim ngan - ((hanh tinh) OR (nhanh tinh)) cua ((thong cong) OR (hang cong)) san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kim ngan - ((hanh tinh) OR (nhanh tinh)) cua ((thong cong) or (hang cong)) san van ban".
• Adding a wildcard symbol may retrieve word variants: hoc kim ngan - ((hanh tinh) OR (nhanh tinh)) cua ((thong cong) or (hang cong)) san van ban*.