Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, khoa phau
khau thong » khau thuong, khap thong, khau tong
hoach thu » hoach thay, doanh thu, hoach su
pho thong » he thong
thu thuc » thuc thuc, thu thuoc, thue thuc
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoi, dac khoa, cao khoa
khoa pho » khoa phu, khoa khoa, khoa phau
sach tai » sach bai, sach tham, sach dao
su sach » so sach, vu sach
tai tue » tri tue, tai tu, tai tieu
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 thu thuc cac khoa pho thong ) or ( su sach tai tue cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach thu thuc cac khoa pho thong ) OR ( su sach tai tue cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach thu thuc cac khoa pho thong ) or ( su sach tai tue cac khoan khau thong ))*.