Perhaps you should try some spelling variations:
hanh thoi » hanh thuoc, nhanh thai, hanh noi
thoi khoi » thoat khoi, hoi khoa, hoc khoi
sach truc » cach thuc, sach tren, sach thu
cach khoa » bach khoa, cac khoa, cac khoan
pho thong » he thong
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
truc cau » truc cu, truc du, truc va
cau cach » cai cach, cac cach, ca cach
khoa pho » khoa phu, khoa khoa, khoa phau
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
khong » phong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach dao thuc hanh thoi khoi khong ) or ( tu sach truc cau cach khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach dao thuc hanh thoi khoi khong ) OR ( tu sach truc cau cach khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach dao thuc hanh thoi khoi khong ) or ( tu sach truc cau cach khoa pho thong ))*.