Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
kho tang » cao tang
danh ki » danh di, danh kien, danh gia
xa danh » va danh, dia danh, nam danh
tu sach » thu sach, su sach, te sach
tang xa » trang xa, tang ma, lang xa
su tien » su kien, su hien, tu tieng
ki su » ky su

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 (thuoc sach)) kho tang xa hoi. lieu va ((cham tuc) OR (tham thuc)) xa danh ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) kho tang xa hoi. lieu va ((cham tuc) OR (tham thuc)) xa danh ki su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) kho tang xa hoi. lieu va ((cham tuc) OR (tham thuc)) xa danh ki su tien".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) kho tang xa hoi. lieu va ((cham tuc) OR (tham thuc)) xa danh ki su tien*.