Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien cac » hien cac, thien cau, thieu cac
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tinh de » tinh da, sinh de, tinh he
tu xa » tu xay, te xa, tu ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. hieu thien cac ((tu xa) or (tu va)) tinh de ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu thien cac ((tu xa) OR (tu va)) tinh de ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu thien cac ((tu xa) or (tu va)) tinh de ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu thien cac ((tu xa) or (tu va)) tinh de ((cua triet) OR (cua viet))*.