Perhaps you should try some spelling variations:
khoan ngoai » khoa ngoai, khoan nhoi, doan ngoai
pho thong » he thong
hanh khoa » hang khoa, anh khoa, hanh hoa
cach thuc » anh thuc, cac thu
thuc thuc » hoc thuc
sach tai » sach bai, sach tham, sach dao
tuc hanh » thuc hanh, tuc thanh, duc hanh
khoa pho » khoa phu, khoa khoa, khoa phau
thuc cac » thuc cach, tuc cac, phuc cac
so sach » so sanh, bo sach, co sach
tai tuc » thai tuc, tai cuc, tai tu
te cach » ve cach, 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: (( so sach tai tuc hanh khoa pho thong ) or ( te cach thuc thuc cac khoan ngoai trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tai tuc hanh khoa pho thong ) OR ( te cach thuc thuc cac khoan ngoai trong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tai tuc hanh khoa pho thong ) or ( te cach thuc thuc cac khoan ngoai trong ))*.