Perhaps you should try some spelling variations:
phu thong » pho thong, phap thong, khau thong
thuc cach » thuoc sach, truoc cach, thuc hanh
sanh tri » thanh tri, dinh tri, minh tri
anh khoa » doanh khoa, hang khoa
khoa phu » khoa phau, khoa thu, hoa phu
de thuc » den thuc, do thuc, ve thuc
so sanh » do sanh
sach de » cach de, sach dao, sach dat
thu anh » thuy anh, thu canh, thu oanh
tri thu » tri thuc, thi thu, tri phu
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh tri thu anh khoa phu thong ) or ( su sach de thuc cach ((khoa hoc) or (hoa hoc)) hong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri thu anh khoa phu thong ) OR ( su sach de thuc cach ((khoa hoc) OR (hoa hoc)) hong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri thu anh khoa phu thong ) or ( su sach de thuc cach ((khoa hoc) or (hoa hoc)) hong ))*.