Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
cap dung » ap dung, chan dung, cach dung
cao dung » cao dang, cao dong, cao ung
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (hieu lang)) - hanh trung ((cap dung) or (cao dung)) cong hach toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - hanh trung ((cap dung) OR (cao dung)) cong hach toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - hanh trung ((cap dung) or (cao dung)) cong hach toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - hanh trung ((cap dung) or (cao dung)) cong hach toan tap*.