Perhaps you should try some spelling variations:
thieu tang » nhieu tang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
trinh san » trinh quan, trinh toan, trinh luan
trinh han » trinh quan
tinh cua » trinh cua, sinh cua, tinh chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu tang - hanh tinh cua ((bang cong) OR (hang cong)) ((trinh san) or (trinh han)) dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tang - hanh tinh cua ((bang cong) OR (hang cong)) ((trinh san) OR (trinh han)) dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tang - hanh tinh cua ((bang cong) OR (hang cong)) ((trinh san) or (trinh han)) dau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tang - hanh tinh cua ((bang cong) OR (hang cong)) ((trinh san) or (trinh han)) dau*.