Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
dan phung » dan phuong, van phung, dan phong
phan cach » nhan cach, phan cac, phan tach
van phan » van phong, van thanh, luan phan
hieu ca » hieu cac, hieu cua, hieu va
sinh va » sinh vat, tinh va, dinh van
va dan » ca dan, va dao, va dau

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)) - nhan sinh va dan phung van phan cach~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu ca)) - nhan sinh va dan phung van phan cach.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - nhan sinh va dan phung van phan cach*.