Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
cach khoan » cac khoan, cach hoan, bach khoa
thuc cach » thuoc sach, truoc cach, thuc hanh
khoan mot » khoan hoi, chon mot, han mot
mot trong » dot trong, mat trong, mot tuong
cach thuc » anh thuc, cac thu
pho thong » he thong
thu cach » thu canh, tu cach, tho cach
thuc phu » thuc pham, thuc thuc, thuc thi
cac khoi » cac thoi, cac khoan, cach thoi
khoi pho » khoi tho, khoi khoa, hoc pho
te sach » toc sach
phu cac » phuc cac, pha cac, phu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tranh thuc cach khoan mot trong ) or ( thu cach thuc phu cac khoi pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tranh thuc cach khoan mot trong ) OR ( thu cach thuc phu cac khoi pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tranh thuc cach khoan mot trong ) or ( thu cach thuc phu cac khoi pho thong ))*.