Perhaps you should try some spelling variations:
bieu dac » biet dac, bieu dat, lieu dao
hieu dac » hieu cac, chieu day, hieu cach
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ly nang xa hoi. hien ((hieu dac) OR (bieu dac)) nuoc ((va danh) or (va dan)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. hien ((hieu dac) OR (bieu dac)) nuoc ((va danh) OR (va dan)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. hien ((hieu dac) OR (bieu dac)) nuoc ((va danh) or (va dan)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. hien ((hieu dac) OR (bieu dac)) nuoc ((va danh) or (va dan)) sai cua tre*.