Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
pho thong » he thong
khoan hoa » khoan hoi, khoan nhoi, khoa hoc
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
khoa pho » khoa phu, khoa khoa, khoa phau
thuc cac » thuc cach, tuc cac, phuc cac
hoa cong » cua cong, va cong, hoa co
so sach » so sanh, bo sach, co sach
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tri thuc hang khoa pho thong ) or ( te sach trien thuc cac khoan hoa cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tri thuc hang khoa pho thong ) OR ( te sach trien thuc cac khoan hoa cong ))*.