Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thuc bach » truc bach, thuc cach, thuoc sach
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
cach thi » cach thoi, cac thi, cach thien
thi thuc » thai thuc, thi thu, thi thuy
khoa pho » khoa phu, khoa khoa, khoa phau
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
tu cach » tu cac
khoa he » hoa he, khoa hoc, khong he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach thi thuc bach khoa pho thong ) or ( thuat sach tham thuc anh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thi thuc bach khoa pho thong ) OR ( thuat sach tham thuc anh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thi thuc bach khoa pho thong ) or ( thuat sach tham thuc anh khoa he thong ))*.