Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hieu thien » hieu hien, chieu chien, dieu khien
hach nuoc » sach nuoc, hoc nuoc, cac nuoc
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua cau » cua cac, cua chu, cua cay
sac ky » cac ky, sai ky
cua cu » cua chu, cua su, cua co

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) OR (sac ky)) nang xa hoi. hieu thien hach nuoc va danh vi ((cua cu) or (cua cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) nang xa hoi. hieu thien hach nuoc va danh vi ((cua cu) OR (cua cau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sac ky)) nang xa hoi. hieu thien hach nuoc va danh vi ((cua cu) or (cua cau))*".