Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
dung khoan » dung khoa, chung khoan, tung khoanh
khoan phai » khong phai, khoan hoi, khoan nhoi
phai thong » phap thong, phai tuong, phan thong
bach khoa » anh khoa
khoa phau » hoa phan, khoa kham, khoa than
cach bien » cam bien, mach dien, sach tien
sach thu » sach thue, sach thieu, sach tham
tue bach » truc bach, thi bach, vu bach
bien cua » ben cua, bien sua, bieu cua
cua dung » cua dang, cua dong, qua dung
su sach » so sach, vu sach
thu tue » thu thue, thu tuc, thu tu
tu cach » tu cac

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 thu tue bach khoa phau thong ) or ( tu cach bien cua dung khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thu tue bach khoa phau thong ) OR ( tu cach bien cua dung khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thu tue bach khoa phau thong ) or ( tu cach bien cua dung khoan phai thong ))*.