Perhaps you should try some spelling variations:
tho thong » theo thong, pho thong, tao thong
sach tham » sach nha
toan tai » toan tap, doanh tai, toan ban
tai thac » tai thanh, khai thac, mai thach
thac cac » thoai cac, thanh cac, thuc cach
cac khoi » cac thoi, cac khoan, cach thoi
khoi tho » hoi tho, khoi khoa, khoi thuy
thu sach » tu sach, thuat sach, thuoc sach
tham tuc » tham thuc, thai tuc, nham thuc
tuc cac » tu cac, tich cac
khoi he » khoa he, khoi de, khong he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat toan tai thac cac khoi tho thong ) or ( thu sach tham tuc cac khoi he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat toan tai thac cac khoi tho thong ) OR ( thu sach tham tuc cac khoi he thong )).
• Adding a wildcard symbol may retrieve word variants: (( thuat toan tai thac cac khoi tho thong ) or ( thu sach tham tuc cac khoi he thong ))*.