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

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