Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
than thong » than thuong, toan thong, tran thong
phau thong » phap thong, khau thong, phan thong
thuy hanh » thuc hanh, thuy anh, thuy canh
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa than » khoa luan, hoa thai, hoa tan
khoa phau » hoa phan, khoa kham, khoa thu
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
tu canh » thu canh, tu chanh, tu can
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 canh thanh thuy hanh khoa than thong ) or ( tu sach tri thuc cac khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh thanh thuy hanh khoa than thong ) OR ( tu sach tri thuc cac khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh thanh thuy hanh khoa than thong ) or ( tu sach tri thuc cac khoa phau thong ))*.