Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
thuoc sach » hoc sach, nuoc sach, thuat sach
ban khong » ban thong, bay khong, san khong
tri thuoc » tri thuc, tri hoc, tin thuoc
sach nang » cach mang, sach dung, sach danh
che thong » nghe thong, theo thong, chet trong
thuc ban » thuoc ban, thuc dan, thu ban
khong he » khong khi, hong ha, khong _
sach tri » sach tai, sach tren, sach truc
nang che » sang che, bang che, nang cho
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: (( te sach trien thuc ban khong he thong ) or ( te sach tri thuoc sach nang che thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trien thuc ban khong he thong ) OR ( te sach tri thuoc sach nang che thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach trien thuc ban khong he thong ) or ( te sach tri thuoc sach nang che thong ))*.