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
pho thong » he thong
sach bai » sach dao, cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
truc cau » truc cu, truc du, truc va
cac khoa » cac khoan, cac khoi, dac khoa
khoa pho » khoa phu, khoa khoa, khoa phau
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
cau cac » ca cac, cuu cac, cau ca
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 bai thuc hanh thoi khoi khong ) or ( tu sach truc cau cac khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach bai thuc hanh thoi khoi khong ) OR ( tu sach truc cau cac khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach bai thuc hanh thoi khoi khong ) or ( tu sach truc cau cac khoa pho thong ))*.