Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
sach tham » sach nha
tham truc » tham thuc, nham thuc, pham thuc
hoach dan » hoach dat, hoach san, hoach toan
khoa khau » khoa kham, khoa phau, khoa chau
dan thuc » dan toc, am thuc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
te sach » toc sach
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 tham truc bach khoa he thong ) or ( thu hoach dan thuc anh khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tham truc bach khoa he thong ) OR ( thu hoach dan thuc anh khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tham truc bach khoa he thong ) or ( thu hoach dan thuc anh khoa khau thong ))*.