Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
thuc thuc » hoc thuc, thuc thai
hanh khoi » hanh thoi, hang khoa, dang khoi
thuat dan » thuat san, thuat ban, thuat dam
mach khoa » bach khoa, anh khoa, may khoa
khoa khau » khoa kham, khoa phau, khoa chau
khau tong » khau thong, khau cong, khau thuong
khoi han » hoi han, khoi can, khoa than
dan tien » dang tien, van tien, dau tien
tu sach » thu sach, su sach, te sach
tien va » dien va, thien van
va mach » va cach, vi mach, ban mach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach thuc thuc hanh khoi han tong ) or ( thuat dan tien va mach khoa khau tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach thuc thuc hanh khoi han tong ) OR ( thuat dan tien va mach khoa khau tong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach thuc thuc hanh khoi han tong ) or ( thuat dan tien va mach khoa khau tong ))*.