Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien hach » thien thanh, hien hanh
nang xa » nang x, lang xa, nang ma
sac ky » sai ky
dau va » dau ve, lau va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
du va » tu va, su va, vu va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang xa hoi. hieu thien hach ((du va) OR (dau va)) hanh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (cac ky)) nang xa hoi. hieu thien hach ((du va) or (dau va)) hanh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (cac ky)) nang xa hoi. hieu thien hach ((du va) or (dau va)) hanh vi cua tu*.