Perhaps you should try some spelling variations:
khoann khoi » khoan hoi, khoan nhoi, khoang thoi
cac khoann » coc khoan, cac khoa
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
khoan hoc » khoa hoc, khoan hoi, khoan nhoi
hoc khong » hoa khong, hoc hong, hoc thuong
dao thuc » dan thuc, dao tuc, do thuc
thuc cac » thuc cach, tuc cac, phuc cac
lan dao » lanh dao, van dao, lan dau
te sach » toc sach
te lan » te luan, te ban, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te lan dao thuc cac khoann khoi khong ) or ( te sach tham thuc cac khoan hoc khong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te lan dao thuc cac khoann khoi khong ) OR ( te sach tham thuc cac khoan hoc khong )).
• Adding a wildcard symbol may retrieve word variants: (( te lan dao thuc cac khoann khoi khong ) or ( te sach tham thuc cac khoan hoc khong ))*.