Perhaps you should try some spelling variations:
trien thuat » thien thuat, trien hoat, chien thuat
khoan phap » khoan phai, khoa phau, han phap
phap thong » phap phong, phap chong, pho thong
thuat cach » thuat sach, thuat canh, thuat mach
cac trien » cac trieu, cac truyen, cach thien
cach khoa » bach khoa, cac khoa, anh khoa
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, tri thuc, dai thuc
thuc cac » thuc cach, tuc cac, phuc cac
te sach » toc sach
hoc cac » hoc cao
khoa he » hoa he, khoa hoc, khong he

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 tai thuc cac khoan phap thong ) or ( hoc cac trien thuat cach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tai thuc cac khoan phap thong ) OR ( hoc cac trien thuat cach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tai thuc cac khoan phap thong ) or ( hoc cac trien thuat cach khoa he thong ))*.