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

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) OR (thu sach)) y nang xa hoi. hieu qua cac loc va ((dan via) or (dan gia)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu qua cac loc va ((dan via) OR (dan gia)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu qua cac loc va ((dan via) or (dan gia)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang xa hoi. hieu qua cac loc va ((dan via) or (dan gia)) cua viet*.