Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
phan lap » phan dau
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
tao hoi » tao khoi, tao boi, thao hoc
tay hoi » tay ho, tay thai
hieu vi » hieu voi, hieu va, hieu ve
va phan » van phan, va phat, va phap
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty hang ((tao hoi) OR (tay hoi)). hieu vi pham duc va phan lap ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty hang ((tao hoi) OR (tay hoi)). hieu vi pham duc va phan lap ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty hang ((tao hoi) OR (tay hoi)). hieu vi pham duc va phan lap ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty hang ((tao hoi) OR (tay hoi)). hieu vi pham duc va phan lap ((cua te) or (cua tu))*.