Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
canh khoa » anh khoa, xanh khoa, doanh khoa
khoa kham » kho khan, khoa than
sach hoi » sach doi, sach moi, cach thoi
sach tai » sach bai, sach tham, sach dao
su sach » so sach, vu sach
te sach » toc sach
va canh » van canh, va cach, ve canh
hoi te » hoi tu, hoi ve, hoi e
te cac » tu cac, ve cac, te cao
tai va » thai va, mai va, tri va

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 hoi te cac khoan pho thong ) or ( te sach tai va canh khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach hoi te cac khoan pho thong ) OR ( te sach tai va canh khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach hoi te cac khoan pho thong ) or ( te sach tai va canh khoa kham thong ))*.