Perhaps you should try some spelling variations:
van xuat » san xuat, va xuat, phan xuat
xa khanh » xa thanh, van khanh, dat khanh
xuat tuc » xuat thuc, luat tuc, xuat tu
hieu van » hieu va, thien van, lieu va
xa hanh » xa thanh, va hanh, da hanh
tu sach » thu sach, su sach, te sach
kv nang » ky nang, ki nang, ke nang
cua tuc » cua duc, cua tu, cua thuoc
v nang » va nang, vu nang, van 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: tu sach ((v nang) or (kv nang)) xa hoi. hieu van xuat tuc ((xa hanh) OR (xa khanh)) vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (kv nang)) xa hoi. hieu van xuat tuc ((xa hanh) OR (xa khanh)) vi cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) or (kv nang)) xa hoi. hieu van xuat tuc ((xa hanh) OR (xa khanh)) vi cua tuc".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) or (kv nang)) xa hoi. hieu van xuat tuc ((xa hanh) OR (xa khanh)) vi cua tuc*.