Perhaps you should try some spelling variations:
cap nuoc » dat nuoc
vu sach » vu bach, su sach, vu khach
cua tre » cuu tre, cua triet, dua tren
cam dan » cac dan, nam dan, cay dan
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ca dan » cac dan, ca dao
ve cap » ve cac, le cap, ve cai
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: vu sach ky nang xa hoi. hieu ve cap nuoc ((cam dan) OR (ca dan)) vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu ve cap nuoc ((cam dan) OR (ca dan)) vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu ve cap nuoc ((cam dan) OR (ca dan)) vai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu ve cap nuoc ((cam dan) OR (ca dan)) vai ((cua tre) or (cua te))*.