Perhaps you should try some spelling variations:
dung truong » duong truong, dung trong, dung trung
truong dang » trong dang, truong giang, truong quang
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu manh » chieu xanh, hieu nganh, hien hanh
mang luan » tang luan, hang luan, bang luan
luan dung » lan dung, luan dong, luan hung
than cao » thai cao, than cap, than sao
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 ((hieu manh) OR (dieu hanh)) - nhanh mang luan dung truong dang ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - nhanh mang luan dung truong dang ((than cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (dieu hanh)) - nhanh mang luan dung truong dang ((than cao) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (dieu hanh)) - nhanh mang luan dung truong dang ((than cao) or (toan cao))*.