Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cac hoc » cach hoc, cac hop, bac hoc
dan via » dan va, dan gia, dan gian
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
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 y nang xa hoi. hieu qua ((cac nuoc) or (cac hoc)) va dan via cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu qua ((cac nuoc) OR (cac hoc)) va dan via cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu qua ((cac nuoc) or (cac hoc)) va dan via cua viet*.