Perhaps you should try some spelling variations:
trung thuat » trong thuat, thuong thuat, trung thuc
chieu sang » chieu sach, chieu xanh, hieu lang
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
cong manh » cong danh, duong manh, cong thanh
toan cau » toan ban, toan tap, toan tai
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 chieu sang - hanh ((trung thuat) or (trung tuan)) nhung cong manh ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh ((trung thuat) OR (trung tuan)) nhung cong manh ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - hanh ((trung thuat) or (trung tuan)) nhung cong manh ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh ((trung thuat) or (trung tuan)) nhung cong manh ((toan cau) OR (toan cao))*.