Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thuc cach » thuoc sach, truoc cach, thuc hanh
mach khoa » bach khoa, anh khoa, may khoa
khoa kham » kho khan, khoa than
kham tong » khau tong, pham trong, khac trong
sach thu » sach thue, sach thieu, sach tham
thu thuc » thuc thuc, thu thuoc, thue thuc
cach hoi » cach thoi, cach noi, cach hoc
san tren » van tren, dan tren, ran tren
tren tim » trien tin, trinh tim, trong tim
tu sach » thu sach, su sach, te sach
hoi han » hoi phan, hoi dan, hoa han

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 thu thuc cach hoi han tong ) or ( thuat san tren tim mach khoa kham tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach thu thuc cach hoi han tong ) OR ( thuat san tren tim mach khoa kham tong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach thu thuc cach hoi han tong ) or ( thuat san tren tim mach khoa kham tong ))*.