Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thu thong » thuy thong, thu thang, thu tuong
thuc thuc » hoc thuc
khoa kham » kho khan, khoa than
kham tong » khau tong, pham trong, khac trong
sach nam » sach nay, sach tham, sach nang
nam thuc » nam thuoc, am thuc, nam thu
thuc anh » thuc hanh, thuy anh, thu anh
anh hoai » thanh hoai, anh hoang, dang hoai
hoai thu » doi thu
anh khoa » doanh khoa, hang khoa
so sach » so sanh, bo sach, co sach
vu cach » va cach, ve cach, vu bach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach nam thuc anh hoai thu thong ) or ( vu cach thuc thuc anh khoa kham tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach nam thuc anh hoai thu thong ) OR ( vu cach thuc thuc anh khoa kham tong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach nam thuc anh hoai thu thong ) or ( vu cach thuc thuc anh khoa kham tong ))*.