Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham loc » cham soc, chon loc, cham o
cua viet » ca viet, hoa viet, cua vat
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va hanh, dia danh
vu cham » va cham, vu kham, tu cham
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((lang xa) or (nang x)) hoi. hieu vu cham loc ((va danh) OR (va dan)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((lang xa) OR (nang x)) hoi. hieu vu cham loc ((va danh) OR (va dan)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((lang xa) or (nang x)) hoi. hieu vu cham loc ((va danh) OR (va dan)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((lang xa) or (nang x)) hoi. hieu vu cham loc ((va danh) OR (va dan)) vi cua viet*.