Perhaps you should try some spelling variations:
quang thoan » quang hoan, quang thoai, quang toan
hieu manh » chieu xanh, hieu nganh, dieu hanh
lang cong » bang cong, hang cong, lang dong
dang cong » dung cong
sang than » cang thang, dang thanh, sang tao
hoc hieu » hoc thieu, hoc hien, doc hieu
san than » san thanh, ban than, van than

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 - tran quang thoan ((lang cong) OR (dang cong)) ((san than) or (sang than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - tran quang thoan ((lang cong) OR (dang cong)) ((san than) OR (sang than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - tran quang thoan ((lang cong) OR (dang cong)) ((san than) or (sang than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - tran quang thoan ((lang cong) OR (dang cong)) ((san than) or (sang than)) cau*.