Perhaps you should try some spelling variations:
nuoc san » nuoc luan, nguoi san, nuoc quan
quoc san » quoc sang, quoc ban, quoc lan
te sach » toc sach
cua tre » cua te, cua triet, dua tren
benh vi » benh va, benh ve, benh li
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. lieu va cam ((quoc san) OR (nuoc san)) benh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. lieu va cam ((quoc san) OR (nuoc san)) benh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. lieu va cam ((quoc san) OR (nuoc san)) benh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. lieu va cam ((quoc san) OR (nuoc san)) benh vi ((cua tre) or (cuu tre))*.