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
hieu va » lieu va, hieu qua
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
cua te » cua tu
y nang » ky nang, ly nang, v nang

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 va ((cam duc) OR (cao 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 va ((cam duc) OR (cao duc)) va ((hanh tai) OR (hang tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu va ((cam duc) OR (cao duc)) va ((hanh tai) or (hang tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu va ((cam duc) OR (cao duc)) va ((hanh tai) or (hang tai)) cua te*.