Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
hanh ban » thanh ban, hang ban, hanh san
cong tan » cong tac, cong san, cong thanh
tan nhan » tran nhan, tao nhan, van nhan
nhan tai » hang tai, van tai, toan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh ban ((cua khong) or (hua khong)) cong tan nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ban ((cua khong) OR (hua khong)) cong tan nhan tai.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh ban ((cua khong) or (hua khong)) cong tan nhan tai*.