Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hang cong » dang cong, hang nong, bang cong
hoc dieu » hoc thieu, hoc hien
hoc sieu » hoc thieu, hoc hien, hoc su
tinh cua » trinh cua, sinh cua, tinh chat
vang van » dang van, tang van, lang 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 dieu) or (hoc sieu)) tinh - hanh tinh cua ((nhung cong) OR (hang cong)) vang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc dieu) OR (hoc sieu)) tinh - hanh tinh cua ((nhung cong) OR (hang cong)) vang van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc dieu) or (hoc sieu)) tinh - hanh tinh cua ((nhung cong) OR (hang cong)) vang van ban*".