Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac truc » cau truc, cac trung, sach truc
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
cac tru » ca tru, cac tro, cac thu
va hanh » van hanh, va danh, ban hanh
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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

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