Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thong dong » thong duong, thuong dong, thong cong
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, trinh han
dong toan » dung toan, bong toan, cong 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 - hanh ((trinh vat) OR (sinh vat)) thong thong dong toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((trinh vat) OR (sinh vat)) thong thong dong toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trinh vat) OR (sinh vat)) thong thong dong toan cau*.