Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. hieu van nam ((xuc va) OR (tuc va)) hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu van nam ((xuc va) OR (tuc va)) hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu van nam ((xuc va) OR (tuc va)) hanh ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu van nam ((xuc va) OR (tuc va)) hanh ((vi cua) or (di cua)) tre*.