Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
van cam » van nam, van lam, van cau
tu sach » su sach, te sach, tu cach
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
vi cua » di cua
o hoi » co hoi, o hoc, o hai

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

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