Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
khan thong » khap thong, khau thong, nhan thong
pho thong » he thong
thuc anh » thuc hanh, thuy anh, thu anh
kho khan » khoa kham, khoa than
sach thu » sach thue, sach thieu, sach tham
thu chua » thu cua, tu chua, thu thuat
chua cac » cua cac, chua cau, chua dac
cac khoi » cac thoi, cac khoan, cach thoi
khoi pho » khoi tho, khoi khoa, hoc pho
su sach » so sach, vu sach
anh kho » anh khoa, anh tho, anh cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach trien thuc anh kho khan thong ) or ( su sach thu chua cac khoi pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach trien thuc anh kho khan thong ) OR ( su sach thu chua cac khoi pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach trien thuc anh kho khan thong ) or ( su sach thu chua cac khoi pho thong ))*.