Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh hang » thanh hoang, thanh thang, tranh hang
nhung cong » thong cong, hang cong, nhung don
hien sach » dien sach, kien sach, chieu sach
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh cao » thanh ca, thanh cac, thanh thao
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) OR (thien hach)) - thanh hang ca ((nhung cong) or (dung cong)) van thanh cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - thanh hang ca ((nhung cong) OR (dung cong)) van thanh cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (thien hach)) - thanh hang ca ((nhung cong) or (dung cong)) van thanh cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (thien hach)) - thanh hang ca ((nhung cong) or (dung cong)) van thanh cao*.