Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
tuong dan » huong dan, tung dan, xuong dan
xuong san » xuong song, cong san, dong san
hoc hieu » hoc thieu, hoc hien, doc hieu
sinh cua » manh cua, dinh cuu, sinh va
cua tong » cua cong, cua dong, cua nong
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 hieu manh - hanh sinh cua tong ((tuong dan) or (xuong san)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh sinh cua tong ((tuong dan) OR (xuong san)) ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh sinh cua tong ((tuong dan) or (xuong san)) ((toan cau) or (toan cao))*.