Perhaps you should try some spelling variations:
thuc doanh » thuc hanh, chuc danh, muc doanh
sach tham » sach nha
pho thong » he thong
sach tai » sach dao, sach xa, tich tai
sach bai » sach dao, cac bai, sach xa
thuc dan » thuc hanh, hoc dan, thuc vat
khoa pho » khoa phu, khoa khoa, khoa phau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((((sach tai) OR (sach bai))) or (sach tham)) ((thuc doanh) or (thuc dan)) khoa pho thong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach tai) OR (sach bai))) OR (sach tham)) ((thuc doanh) OR (thuc dan)) khoa pho thong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((((sach tai) OR (sach bai))) or (sach tham)) ((thuc doanh) or (thuc dan)) khoa pho thong".
• Adding a wildcard symbol may retrieve word variants: su ((((sach tai) OR (sach bai))) or (sach tham)) ((thuc doanh) or (thuc dan)) khoa pho thong*.