Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, kien thuc
phau thong » phap thong, khau thong, phan thong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa phau » hoa phan, khoa kham, khoa than
sach tri » sach tai, sach tren, sach bai
dan khoa » dang khoa, da khoa, san khoa
te sach » toc sach
khoa he » hoa he, khoa hoc, khong he
tue dan » tuc dan, te dan, tre dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach trien thuc hang khoa he thong ) or ( te sach tri tue dan khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trien thuc hang khoa he thong ) OR ( te sach tri tue dan khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach trien thuc hang khoa he thong ) or ( te sach tri tue dan khoa phau thong ))*.