Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
van dau » van dao, phan dau
luc van » luoc van, luu van, duc van
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((van cam) or (van dau)) luc van hanh di ((dua tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((van cam) OR (van dau)) luc van hanh di ((dua tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((van cam) or (van dau)) luc van hanh di ((dua tren) or (cua viet))*.