Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
chieu sang » chieu sach, chieu xanh, hieu lang
duong vanh » duong van, duong manh, duong anh
duong xanh » duong manh, duong van, duong sach
canh manh » lanh manh, canh tranh, cach mang
cua nhung » va nhung
manh cua » doanh cua, ban cua
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 khang) or (chieu sang)) - canh manh cua nhung ((duong vanh) or (duong xanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu khang) OR (chieu sang)) - canh manh cua nhung ((duong vanh) OR (duong xanh)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu khang) or (chieu sang)) - canh manh cua nhung ((duong vanh) or (duong xanh)) toan cau*.