Perhaps you should try some spelling variations:
dieu cuu » dinh cuu, dien cuc, dieu can
dieu cua » dieu tra
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va hoc » van hoc
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
nuoc » quoc, duoc, ngoc

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 ty nang xa hoi. lieu va hoc nuoc ((va dan) or (ca dan)) ((dieu cuu) or (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. lieu va hoc nuoc ((va dan) OR (ca dan)) ((dieu cuu) OR (dieu cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. lieu va hoc nuoc ((va dan) or (ca dan)) ((dieu cuu) or (dieu cua)) tre*.