Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
duong vanh » duong van, duong manh, duong xanh
vanh quan » van quan, anh quan, manh quan
manh cua » doanh cua
quan cau » quang cao, toan cau, quan ha
ban cua » ban quan

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 sang) or (chieu sang)) - canh ((manh cua) OR (ban cua)) nhung duong vanh quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - canh ((manh cua) OR (ban cua)) nhung duong vanh quan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sang)) - canh ((manh cua) OR (ban cua)) nhung duong vanh quan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - canh ((manh cua) OR (ban cua)) nhung duong vanh quan cau*.