Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
khap thong » phap thong, khau thong, khac thuong
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khap » khoa kham, khoa khac, kho khan
cach thuc » anh thuc, cac thu
thuc phu » thuc pham, thuc thuc, thuc thi
cac khoi » cac thoi, cac khoan, cach thoi
tu sach » thu sach, su sach, te sach
su cach » su sach, tu cach, su cac
phu cac » phuc cac, pha cac, phu can
khoi he » khoa he, khoi de, khong he

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 trien thuc hanh khoa khap thong ) or ( su cach thuc phu cac khoi he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien thuc hanh khoa khap thong ) OR ( su cach thuc phu cac khoi he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien thuc hanh khoa khap thong ) or ( su cach thuc phu cac khoi he thong ))*.