Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
cap nhung » cam nhung, dap nhung, canh nhung
vap nhung » va nhung, ve nhung, voi nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban

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 - thanh trung ((cap nhung) OR (vap nhung)) cong san ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh trung ((cap nhung) OR (vap nhung)) cong san ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - thanh trung ((cap nhung) OR (vap nhung)) cong san ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh trung ((cap nhung) OR (vap nhung)) cong san ((toan tai) or (toan ban))*.