Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
sach thai » sach tham, sac thai, sach tai
khoa kham » kho khan, khoa than
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoan, cac khoi, dac khoa
thai hoc » dai hoc, bai hoc, hoi hoc
dan khoa » dang khoa, da khoa, san khoa
te sach » toc sach
tue cac » tu cac, tuc cac, te cac
khoa he » hoa he, khoa hoc, khong he
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tri tue cac khoa he thong ) or ( so sach thai hoc dan khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tri tue cac khoa he thong ) OR ( so sach thai hoc dan khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tri tue cac khoa he thong ) or ( so sach thai hoc dan khoa kham thong ))*.