Perhaps you should try some spelling variations:
truong chung » truong trung
trinh chao » trinh chat, trinh co, trinh giao
hieu sang » chieu sang, hieu lang, hieu quang
trinh han » trinh quan
chung tap » chung ta, nhung tap, chung than
tap doanh » tap doan, lap doanh, tap danh
doanh bat » danh bat, doanh tai, doanh va
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - hanh ((trinh chao) or (trinh han)) truong chung tap doanh bat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh ((trinh chao) OR (trinh han)) truong chung tap doanh bat.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh ((trinh chao) or (trinh han)) truong chung tap doanh bat*.