Perhaps you should try some spelling variations:
dong tuong » dong thuong, dong thong, dong trong
thieu xanh » chieu xanh, hieu manh, thien anh
hien hanh » dieu hanh
trinh cua » trinh luat, trinh quan, trinh luan
tuong dan » huong dan, tung dan, xuong dan
tinh cua » sinh cua, tinh chat, tranh cua
dan toan » van toan, dan than, manh toan
toan ban » van ban

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 xanh) or (hien hanh)) - hanh ((tinh cua) OR (trinh cua)) dong tuong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hien hanh)) - hanh ((tinh cua) OR (trinh cua)) dong tuong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hien hanh)) - hanh ((tinh cua) OR (trinh cua)) dong tuong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hien hanh)) - hanh ((tinh cua) OR (trinh cua)) dong tuong dan toan ban*.