Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cong cua » cong cu, dong cua, huong cua
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
y nang » ky nang, v nang, may nang
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de 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 ((y nang) OR (ly nang)) xa hoi. hieu ve cac nuoc va hanh ((di cua) or (cong cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. hieu ve cac nuoc va hanh ((di cua) OR (cong cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) xa hoi. hieu ve cac nuoc va hanh ((di cua) or (cong cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) xa hoi. hieu ve cac nuoc va hanh ((di cua) or (cong cua)) te*.