Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoan khau » khoanh khac, khoa kham, khoa phau
hoach dai » hoach dat, hoc dai, hoa dai
cach khoa » bach khoa, cac khoa, anh khoa
hoc cach » hoc cac, hoc sach, cuoc cach
sach tri » sach tai, sach tren, sach truc
khoa he » hoa he, khoa hoc, khong he
tu sach » thu sach, su sach, te sach
tue cac » tu cac, tuc cac, te cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach dai hoc cach khoa he thong ) or ( tu sach tri tue cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach dai hoc cach khoa he thong ) OR ( tu sach tri tue cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach dai hoc cach khoa he thong ) or ( tu sach tri tue cac khoan khau thong ))*.