Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thien danh » thien anh, thien dang, thien thanh
tong tuong » trong tuong, tuong tuong, tong thuong
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 cau » toan cao, toan ban, toan tap

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