Perhaps you should try some spelling variations:
thien van » thi van
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
cap nuoc » dat nuoc
dau treo » dau tren, cau treo, dau theo
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hanh va » hanh vi
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 y nang xa hoi. thien van ((cac nuoc) or (cap nuoc)) va ((hanh va) OR (hang va)) dau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. thien van ((cac nuoc) OR (cap nuoc)) va ((hanh va) OR (hang va)) dau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. thien van ((cac nuoc) or (cap nuoc)) va ((hanh va) OR (hang va)) dau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. thien van ((cac nuoc) or (cap nuoc)) va ((hanh va) OR (hang va)) dau treo*.