Perhaps you should try some spelling variations:
truong chung » truong trung
hieu quang » thieu quang, hieu quan, hieu qua
chung tinh » nhung tinh, chung minh, hung tinh
hieu lang » chieu sang, nhieu tang, hieu van
hanh dung » thanh dung, anh dung, hanh dong
xa truong » cac truong
toan tap » toan ban
dung xa » duong xa, dung ha, dong xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((hieu lang) or (hieu quang)) - hanh dung xa truong chung tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((hieu lang) OR (hieu quang)) - hanh dung xa truong chung tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: co ((hieu lang) or (hieu quang)) - hanh dung xa truong chung tinh toan tap*.