Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » nhan luc, cham cuu, chat lua
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
va anh » van anh, va danh, va hanh
anh va » hanh va

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 lang xa hoi. hieu va ((cham luc) OR (cham soc)) va anh va ((cua viet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu lang xa hoi. hieu va ((cham luc) OR (cham soc)) va anh va ((cua viet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu lang xa hoi. hieu va ((cham luc) OR (cham soc)) va anh va ((cua viet) or (va triet))*".