Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, cach thien
trien thuc » trien thuoc, tren thuc, trien thuat
hoach khoa » hoach hoa, doanh khoa, hoc khoa
phap thong » phap phong, phap chong, pho thong
thieu thu » tieu thu, thi thu, thieu nhi
khoa phap » khoa phau, khoan phai, khong phap
thuc cac » thuc cach, tuc cac, phuc cac
khoan he » khoa he, khoan ke, khoan le
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach

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