Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
cua nhan » ca nhan, cua ngan, cua nha
cua viet » hoa viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
luc van » luoc van, duc van, luc va
luu van » cuu van, luan van, luu hanh
ca viet » va viet, co viet, hoa viet
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 cua nhan ((luc van) or (luu van)) hanh vi ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu cua nhan ((luc van) OR (luu van)) hanh vi ((cua viet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu cua nhan ((luc van) or (luu van)) hanh vi ((cua viet) or (ca viet))*.