Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
cach thuc » anh thuc, cac thu
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoi, dac khoa, cao khoa
te sach » toc sach
tue cac » tuc cac, te cac
thuc tu » thuoc tu, thuc te, thu tu
khoa he » hoa he, khoa hoc, 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: (( te sach tri tue cac khoan phau thong ) or ( tu cach thuc tu cac khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tri tue cac khoan phau thong ) OR ( tu cach thuc tu cac khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tri tue cac khoan phau thong ) or ( tu cach thuc tu cac khoa he thong ))*.