Perhaps you should try some spelling variations:
than xuong » phan xuong, than uong, thanh huong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
phu thong » pho thong, phap thong, khau thong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
khoa than » khoa luan, hoa thai, hoa tan
khoa phu » khoa phau, khoa thu, hoa phu
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
tu sach » thu sach, su sach, te sach

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 tham thuc cach khoa phu thong ) or ( tu sach tren thuc anh khoa than xuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc cach khoa phu thong ) OR ( tu sach tren thuc anh khoa than xuong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc cach khoa phu thong ) or ( tu sach tren thuc anh khoa than xuong ))*.