Perhaps you should try some spelling variations:
hoang hanh » hoang thanh, hoang anh, hoang xanh
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua khong, cua tong
cong danh » cuong danh, cong dan, cong thanh
hoc hieu » hoc thieu, hoc hien, doc hieu
hanh cua » manh cua, hang cua, hanh sua
tuan tap » toan tap, tuyen tap, toan tai
tuan tai » toan tai, quan tai, tan tai

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 lang - hoang hanh cua thong cong danh ((tuan tap) or (tuan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hoang hanh cua thong cong danh ((tuan tap) OR (tuan tai)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hoang hanh cua thong cong danh ((tuan tap) or (tuan tai))*.