Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
phau thong » phap thong, khau thong, phan thong
canh tran » canh tranh, hanh trang, banh trang
tran thuy » thanh thuy, tran thi, tran huu
thuy hanh » thuc hanh, thuy anh, thuy canh
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
khoa phau » hoa phan, khoa kham, khoa than
hanh kho » hanh khu, hang khoa, hanh theo
kho khan » khoa kham, khoa than
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
tu canh » thu canh, tu chanh, tu can
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: (( tu canh tran thuy hanh kho khan thong ) or ( su sach tham thuc cac khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh tran thuy hanh kho khan thong ) OR ( su sach tham thuc cac khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh tran thuy hanh kho khan thong ) or ( su sach tham thuc cac khoa phau thong ))*.