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

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 ((((dan via) OR (dan gian))) or (dan gia)) cua 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 ((((dan via) OR (dan gian))) OR (dan gia)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu qua cac loc va ((((dan via) OR (dan gian))) or (dan gia)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu qua cac loc va ((((dan via) OR (dan gian))) or (dan gia)) cua viet*.