Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang xa » nang x, lang xa, nang ma
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
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: hoc sach y nang xa hoi. hieu van chat ((luc van) or (duc van)) hanh ((vi cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang xa hoi. hieu van chat ((luc van) OR (duc van)) hanh ((vi cua) OR (lai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang xa hoi. hieu van chat ((luc van) or (duc van)) hanh ((vi cua) or (lai cua)) tre*.