Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
cac bac » cac bai, cac ban, cac cach
tu sach » su sach, te sach, tu cach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cac dac » cac dan, cac dai, cac tac
va dan » ca dan, va dao, va dau

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