Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh quan, trinh luan
cong van » cong vang, cong san, song van
van phan » van phong, van thanh, luan phan
phan cau » phan dau, phan cac, phan tu
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (hieu ca)) - hanh ((trinh cua) or (trinh luat)) nhung cong van phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu ca)) - hanh ((trinh cua) OR (trinh luat)) nhung cong van phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - hanh ((trinh cua) or (trinh luat)) nhung cong van phan cau*.