Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung song » nhung cong, nhung chong, nhung huong
nhung bong » nhung cong, nhung bang, nhung chong
hieu cach » hieu cac, chieu sach, hieu ca
hanh tong » hanh trong, han tong, hanh dong
tong quan » thong quan, tong luan, luong quan
van thanh » ban thanh, van tuan
thanh bac » nhanh bac, thanh bai, thanh san

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (hieu cach)) - hanh tong quan ((nhung song) OR (nhung bong)) van thanh bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (hieu cach)) - hanh tong quan ((nhung song) OR (nhung bong)) van thanh bac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (hieu cach)) - hanh tong quan ((nhung song) OR (nhung bong)) van thanh bac".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (hieu cach)) - hanh tong quan ((nhung song) OR (nhung bong)) van thanh bac*.