Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
xa hanh » xa thanh, xa khanh, va hanh
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
cau tu » dau tu, cau truc
vi cua » vai cua
di cua » dai cua, doi cua, de cua
tu xa » tu xay, tu va, te xa

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 ((y nang) or (v nang)) xa hoi. hieu van cau tu xa hanh ((vi cua) OR (di cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu van cau tu xa hanh ((vi cua) OR (di cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (v nang)) xa hoi. hieu van cau tu xa hanh ((vi cua) OR (di cua)) tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) xa hoi. hieu van cau tu xa hanh ((vi cua) OR (di cua)) tu*.