Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cam duc » cam xuc, pham duc, nam duoc
nang xa » lang xa, nang ma, mang xa
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va cua » va chua, via cua, ca cua
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: hoc sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam duc) or (cao duc)) va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam duc) or (cao duc)) va hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam duc) or (cao duc)) va hanh va cua te*.