Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
cac phuong » cac truong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
khoa khoa » hoa khoa, khuan khoa, khoa hoc
sach truc » cach thuc, sach thu, sach thue
truc thuy » truc thuoc, thuc thuc, thu thuy
phuong te » phuong tien, phuong tren, phuong tay
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
thuy cac » thuyet cac, thuc cach, thuy canh
te thong » te thuong, he thong, te trong
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co 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 tren thuc anh khoa khoa thong ) or ( so sach truc thuy cac phuong te thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren thuc anh khoa khoa thong ) OR ( so sach truc thuy cac phuong te thong ))*.