Perhaps you should try some spelling variations:
hanh van » thanh van, khanh van, hanh va
hanh tai » thanh tai, hang tai, han tai
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
nam tu » nam thu, nam thuc
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: su sach y nang x hoi. ((hieu ve) or (hieu va)) nam tu va ((hanh van) or (hanh tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. ((hieu ve) OR (hieu va)) nam tu va ((hanh van) OR (hanh tai)) cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu ve) or (hieu va)) nam tu va ((hanh van) or (hanh tai)) cua viet*.