Perhaps you should try some spelling variations:
van xuat » va xuat, phan xuat, van chat
xa hanh » xa thanh, xa khanh, va hanh
su sach » so sach
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, vu khach
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
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: ((su sach) or (vu sach)) ly nang o hoi. hieu ((van xuat) OR (san xuat)) tuc xa hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly nang o hoi. hieu ((van xuat) OR (san xuat)) tuc xa hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ly nang o hoi. hieu ((van xuat) OR (san xuat)) tuc xa hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly nang o hoi. hieu ((van xuat) OR (san xuat)) tuc xa hanh vi cua tu*.