Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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