Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh thuc » trinh tu, trinh thi
xanh khong » nganh khong, anh thong, benh khong
thuc xanh » thuc hanh, thuc thanh, thuc dan
sach tien » sach tren, sach thieu
tien thuc » trien thuc, kien thuc, bien thuc
anh khoan » anh khoa, anh nhan, anh hoang
thu sach » thuat sach, thuoc sach, thu hoach
khong he » khong khi, hong ha, khong _
thuc anh » thuc hanh, thuy anh, thu anh
khoan ke » khoan le, khoan va, toan ke
ke trong » le trong, ke trang, ben trong
tu sach » su sach, te sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach trinh thuc xanh khong he thong ) or ( tu sach tien thuc anh khoan ke trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach trinh thuc xanh khong he thong ) OR ( tu sach tien thuc anh khoan ke trong )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach trinh thuc xanh khong he thong ) or ( tu sach tien thuc anh khoan ke trong ))*.