Perhaps you should try some spelling variations:
sach tich » mach tich, sach kinh, suc tich
hach tich » mach tich, thanh tich, hoc tich
toan giao » ton giao, toan cao, hoa giao
don gian » dan gian
tich bao » tich va, tich cac
tu hach » tu hanh, tu cach, vu khach
tich so » tinh son
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 hach tich so - don gian ) or ( tu sach tich bao - toan giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hach tich so - don gian ) OR ( tu sach tich bao - toan giao )).
• Adding a wildcard symbol may retrieve word variants: (( tu hach tich so - don gian ) or ( tu sach tich bao - toan giao ))*.