Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
ly nang » ky nang, ly hang, ly vang
cac luc » cau luc, coc luc, cac nuoc
qua cac » cua cac
tu sach » su sach, te sach, tu cach
y nang » ky nang, v nang, may nang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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