Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
va cam » va cham, va cac, va cao
di cua » doi cua, de cua, do cua

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 tu nang xa hoi. hieu va cam xuc ((va hanh) OR (van hanh)) ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. hieu va cam xuc ((va hanh) OR (van hanh)) ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang xa hoi. hieu va cam xuc ((va hanh) OR (van hanh)) ((di cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu va cam xuc ((va hanh) OR (van hanh)) ((di cua) or (dai cua)) tre*.