Perhaps you should try some spelling variations:
khoann phai » khoan phai, khong phai
cac khoann » cac khoan, coc khoan, cac khoa
phai tuong » phan thuong, pham thuong, pham truong
tranh thuc » trinh thuc, trang thuc, thanh thuy
phau thong » phap thong, khau thong, phan thong
cach thuc » anh thuc, cac thu
thuc thuc » hoc thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phau » hoa phan, khoa kham, khoa than
thu cach » thu canh, tu cach, tho cach
thuc cac » tuc cac, phuc cac, thac cac
tu canh » thu canh, tu chanh, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu cach thuc thuc cac khoann phai tuong ) or ( tu canh tranh thuc cach khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu cach thuc thuc cac khoann phai tuong ) OR ( tu canh tranh thuc cach khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu cach thuc thuc cac khoann phai tuong ) or ( tu canh tranh thuc cach khoa phau thong ))*.