Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
dan via » dan va, dan gia, dan gian
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
loc va » luc va
via ca » via cua, va ca, gia ca

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 nang xa hoi. hieu qua cac ((loc va) or (hoc va)) dan via ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu qua cac ((loc va) OR (hoc va)) dan via ca viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu qua cac ((loc va) or (hoc va)) dan via ca viet*.