Perhaps you should try some spelling variations:
nuoc quan » nuoc luan, quoc quan, nguoi quan
benh vi » benh va, benh ve, benh li
xuc san » xuc ban, luc sang, nuoc san
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
sai ky » sac ky
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai

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 ky) OR (sai ky)) nang o hoi. hieu va cam ((xuc san) OR (nuoc quan)) benh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sai ky)) nang o hoi. hieu va cam ((xuc san) OR (nuoc quan)) benh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sai ky)) nang o hoi. hieu va cam ((xuc san) OR (nuoc quan)) benh vi cua tre*.