Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh lap » trinh lap, tinh lao, dinh lap
phan duc » pham duc, phan dau, tran duc
tao khoi » tao hoi, thao khoa, lao khoa
lap cua » lai cua, tap cua, lam cua
va tinh » may tinh
hieu ve » hieu va, hieu van
ly hang » ly quang
ty sang » ty xang, ty hang, duy sang
cua te » cua tu

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 sang) or (ly hang)) tao khoi. hieu ve ((phan duc) OR (phan tu)) va tinh lap cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty sang) OR (ly hang)) tao khoi. hieu ve ((phan duc) OR (phan tu)) va tinh lap cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty sang) or (ly hang)) tao khoi. hieu ve ((phan duc) OR (phan tu)) va tinh lap cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty sang) or (ly hang)) tao khoi. hieu ve ((phan duc) OR (phan tu)) va tinh lap cua te*.