Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
tinh lap » trinh lap, tinh lao, dinh lap
lap cua » lai cua, tap cua, lam cua
va tinh » may tinh
ve phat » va phat, te phat, de phat
tao hoi » tao khoi, tao boi, tay hoi
ky danh » ky anh, ky dang
ky sang » ky nang, ky dang, ky tang
v pham » vi pham, d pham
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: doc sach ((ky sang) or (ky danh)) tao hoi. hieu ((ve phat) or (v pham)) duc va tinh lap cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ky sang) OR (ky danh)) tao hoi. hieu ((ve phat) OR (v pham)) duc va tinh lap cua te.
• Adding a wildcard symbol may retrieve word variants: doc sach ((ky sang) or (ky danh)) tao hoi. hieu ((ve phat) or (v pham)) duc va tinh lap cua te*.