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
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
khoa kham » kho khan, khoa than
thu sach » tu sach, thuat sach, thuoc sach
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
cac dai » cac dan, cac bai, can dai
dai ve » dap ve, dau ve, dai va
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac dai ve cac khoan pho thong ) or ( thu sach tham thuc anh khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac dai ve cac khoan pho thong ) OR ( thu sach tham thuc anh khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cac dai ve cac khoan pho thong ) or ( thu sach tham thuc anh khoa kham thong ))*.