Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
thuat may » thuat xay, thuat gay, thuat bai
khoa phau » hoa phan, khoa kham, khoa than
ki thuat » ky thuat
may khoa » da khoa, ly khoa, y khoa
sach tai » sach bai, sach tham, sach dao
tai nuoc » tai quoc, thi nuoc, tham nuoc
nuoc anh » ngoc anh, nuoc sach, duc anh
anh khoa » doanh khoa, hang khoa
tu sach » thu sach, te sach, tu cach
sach ki » sach kinh, sach bai, sach kem
khoa he » hoa he, khoa hoc, khong he
su sach » so sach, vu sach

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 ki thuat may khoa he thong ) or ( su sach tai nuoc anh khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ki thuat may khoa he thong ) OR ( su sach tai nuoc anh khoa phau thong ))*.