Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
hach khoan » cac khoan, hach toan, bach khoa
khoan phai » khong phai, khoan hoi, khoan nhoi
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phau » hoa phan, khoa kham, khoa than
chuc hach » chuc hanh, thuc hanh, chuc danh
phai tong » phai tuong, phan tong, thai tong
sach dao » lanh dao
dao chuc » da chuc, dao chu, dao duc
su sach » so sach, vu sach
te sach » toc sach

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 tham thuc cach khoa phau thong ) or ( te sach dao chuc hach khoan phai tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuc cach khoa phau thong ) OR ( te sach dao chuc hach khoan phai tong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuc cach khoa phau thong ) or ( te sach dao chuc hach khoan phai tong ))*.