Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dao duc » giao duc, tao duoc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. ((hieu va) or (hieu van)) dao duc va hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu va) OR (hieu van)) dao duc va hanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu va) or (hieu van)) dao duc va hanh di cau tren*.