Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
su triet » su viet, su tien, ve triet
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
cac lao » ca lao, cac loai, cac giao
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
y nang » ky nang, ly nang, v nang
lao va » tao va, cao va, bao va

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) or (te sach)) y nang xa hoi. ((hieu hien) OR (chieu chien)) cac lao va dinh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang xa hoi. ((hieu hien) OR (chieu chien)) cac lao va dinh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang xa hoi. ((hieu hien) OR (chieu chien)) cac lao va dinh va su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang xa hoi. ((hieu hien) OR (chieu chien)) cac lao va dinh va su triet*.