Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, bieu hien
hach nuoc » sach nuoc, hoc nuoc, cac nuoc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. ((hieu thien) or (dieu khien)) hach nuoc va xanh di ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. ((hieu thien) OR (dieu khien)) hach nuoc va xanh di ((cua tu) OR (cua cu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. ((hieu thien) or (dieu khien)) hach nuoc va xanh di ((cua tu) OR (cua cu))*".