Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, bach khoa
hoach dao » hoach dat, hoach do, hoach giao
thuc cach » thuoc sach, truoc cach, thuc hanh
phuc cach » phuc cac, hoc cach, phuc cam
cach khoa » bach khoa, cac khoa, cac khoan
khoa phan » hoa phan, khoa than, khoa phau
phan tong » phan trong, phan cong, han tong
dao thuc » dan thuc, dao tuc, do thuc
khoan le » khoan ke, hon le, khoan va
le thong » le thuong, he thong, le hong
sach thi » sach thu, sach tai, sach thieu
thi phuc » thi phu, thi thuc, thien phuc
tu sach » thu sach, su sach, te sach

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 dao thuc cach khoan le thong ) or ( tu sach thi phuc cach khoa phan tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach dao thuc cach khoan le thong ) OR ( tu sach thi phuc cach khoa phan tong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach dao thuc cach khoan le thong ) or ( tu sach thi phuc cach khoa phan tong ))*.