Perhaps you should try some spelling variations:
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
tao khoi » tao hoi, thao khoa, lao khoa
va thanh » gia thanh, ban thanh, va tinh
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
hieu vi » hieu voi, hieu va, hieu ve
san cua » sang cua, ban cua, dan cua
cua te » cua tu
pham » phan

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) OR (toc sach)) ((ky sang) or (ky dang)) tao khoi. hieu vi pham duc va thanh san cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) ((ky sang) OR (ky dang)) tao khoi. hieu vi pham duc va thanh san cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (toc sach)) ((ky sang) or (ky dang)) tao khoi. hieu vi pham duc va thanh san cua te".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (toc sach)) ((ky sang) or (ky dang)) tao khoi. hieu vi pham duc va thanh san cua te*.