Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cham duc » pham duc, cham soc, pham duy
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (thu hoach)) ky nang xa hoi. hieu va cham duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (thu hoach)) ky nang xa hoi. hieu va cham duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (thu hoach)) ky nang xa hoi. hieu va cham duc va hanh vi cua tre*.