Perhaps you should try some spelling variations:
nang khoan » hang khoa, nang phan, dang khoa
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
thuoc bach » thuoc sach, thuoc ban, truc bach
bai thuoc » ban thuoc, bai hoc, cay thuoc
sach thi » sach thu, sach tai, sach thieu
cuu nang » chuc nang, cam nang, cuu van
cach bai » cac bai, sach bai, cach bao
bach hoa » bach khoa, bach ha, cach hoan
su sach » so sach, vu sach
thi cuu » thi cuc, thi huu, thi cu
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 thi cuu nang khoan phai thong ) or ( tu cach bai thuoc bach hoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thi cuu nang khoan phai thong ) OR ( tu cach bai thuoc bach hoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thi cuu nang khoan phai thong ) or ( tu cach bai thuoc bach hoa he thong ))*.