Perhaps you should try some spelling variations:
xuan trinh » qua trinh, xuan dinh, xuan kinh
duoc duoc » duoc hoc, hoc duoc, soc duoc
va trinh » van trinh, va tinh, lap trinh
hieu van » hieu va, thien van, lieu va
van duoc » van duc, vat duoc, tan duoc
van cua » vang cua, ban cua, dan cua
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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