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