Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luan, trinh chat
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh ((((trinh cua) OR (trinh quan))) or (trinh luat)) dung cong vang toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((((trinh cua) OR (trinh quan))) OR (trinh luat)) dung cong vang toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((((trinh cua) OR (trinh quan))) or (trinh luat)) dung cong vang toan tap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((((trinh cua) OR (trinh quan))) or (trinh luat)) dung cong vang toan tap*.