Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
ky dang » ky nang
ky danh » ky anh
xuc van » duc van, luc van, vuc van
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 ((ky dang) OR (ky danh)) ma hoa. ((hieu van) or (lieu va)) cam xuc van hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky dang) OR (ky danh)) ma hoa. ((hieu van) OR (lieu va)) cam xuc van hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky dang) OR (ky danh)) ma hoa. ((hieu van) or (lieu va)) cam xuc van hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) OR (ky danh)) ma hoa. ((hieu van) or (lieu va)) cam xuc van hanh dai cua te*.