Perhaps you should try some spelling variations:
xanh khong » nganh khong, anh thong, benh khong
khong pham » khong phai, khong phap, thuong pham
thuc xanh » thuc hanh, thuc thanh, thuc dan
pham cong » phan cong
phu thong » pho thong, phap thong, khau thong
sach tai » sach bai, sach tham, sach xa
tai thuc » thai thuc, tri thuc, dai thuc
sach dao » lanh dao
anh khoa » doanh khoa, hang khoa
khoa phu » khoa phau, khoa thu, hoa phu
tu sach » thu sach, su sach, te sach
dao thu » dao thi, dao phu, dao tru
thu anh » thuy anh, thu canh, thu oanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tai thuc xanh khong pham cong ) or ( tu sach dao thu anh khoa phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tai thuc xanh khong pham cong ) OR ( tu sach dao thu anh khoa phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tai thuc xanh khong pham cong ) or ( tu sach dao thu anh khoa phu thong ))*.