Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
thieu xanh » chieu xanh, hieu manh, thien danh
thien anh » thien danh, tien anh, thien thanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, manh toan
sinh va » sinh vat, tinh va, dinh van

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 anh)) - hanh sinh va nhung chong ((van toan) OR (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - hanh sinh va nhung chong ((van toan) OR (van thanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - hanh sinh va nhung chong ((van toan) OR (van thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - hanh sinh va nhung chong ((van toan) OR (van thanh)) cao*.