Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xuc van » duc van, luc van, vuc van
duc ban » duc tan, duc van, dua ban
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ve chat ((xuc van) or (duc ban)) hanh ((vi cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang x hoi. hieu ve chat ((xuc van) OR (duc ban)) hanh ((vi cua) OR (lai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: doc sach y nang x hoi. hieu ve chat ((xuc van) or (duc ban)) hanh ((vi cua) or (lai cua)) tre*.