Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
hang dong » hang nong, hang cong, lang dong
hanh dong » anh dong, ha dong
dinh cuu » dinh chi
tam toan » tap toan, tam than, pham toan
toan cau » toan cao, toan ban, toan tap

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

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