Perhaps you should try some spelling variations:
yen lang » den lang, ten lang, yen giang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
dao lai » dao lam, dao bai, dao hai
lai cua » dai cua, hai cua, lai chau
y lang » o lang, tay lang
_ lang » o lang, _ land
va dao » ca dao
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: tu sach ((((y lang) OR (yen lang))) or (_ lang)) xa hoi. hieu va cac nuoc va dao lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((y lang) OR (yen lang))) OR (_ lang)) xa hoi. hieu va cac nuoc va dao lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((((y lang) OR (yen lang))) or (_ lang)) xa hoi. hieu va cac nuoc va dao lai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((((y lang) OR (yen lang))) or (_ lang)) xa hoi. hieu va cac nuoc va dao lai cua te*.