Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
thuc cach » thuoc sach, truoc cach, thuc hanh
pho thong » he thong
thuc cac » tuc cac, phuc cac, thac cac
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, tri thuc, dai thuc
cach chi » cach thoi, cach nhin, banh chi
tu sach » thu sach, su sach, te sach
chi pho » chi phi, chi khoa, chi phan

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 trien thuc cac khoan phau thong ) or ( tu sach tai thuc cach chi pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien thuc cac khoan phau thong ) OR ( tu sach tai thuc cach chi pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien thuc cac khoan phau thong ) or ( tu sach tai thuc cach chi pho thong ))*.