Perhaps you should try some spelling variations:
phap thong » phap phong, phap chong, pho thong
hoach toan » hach toan
thai truc » thai thuc, thai tuc, thi truc
bach khoa » anh khoa
khoa phap » khoa phau, khoan phai, khong phap
thi hoach » thu hoach, thi hanh, thi hoa
sac thai » rac thai, sach tham, toc thai
thai thi » tai thi, hai thi, thai nhi
toan dan » toan ban, toan dam, toan dai
dan tong » dan trong, han tong, dan dong
tu sac » tu sach, tu cac, tu san
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sac thai truc bach khoa phap thong ) or ( so sac thai thi hoach toan dan tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sac thai truc bach khoa phap thong ) OR ( so sac thai thi hoach toan dan tong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sac thai truc bach khoa phap thong ) or ( so sac thai thi hoach toan dan tong ))*.