Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
qua ca » qua cac, qua cua, qua cai
xuc va » tuc va, luc va, xac va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. hieu qua ca ((xuc va) or (duc va)) ((hanh tai) or (hang tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu qua ca ((xuc va) OR (duc va)) ((hanh tai) OR (hang tai)) cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu qua ca ((xuc va) or (duc va)) ((hanh tai) or (hang tai)) cua te*.