Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
van cam » van nam, van lam, van cau
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuoc sach)) ky lang xa hoi. hieu van cam tuc ((va danh) OR (va dinh)) di cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky lang xa hoi. hieu van cam tuc ((va danh) OR (va dinh)) di cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuoc sach)) ky lang xa hoi. hieu van cam tuc ((va danh) OR (va dinh)) di cau theo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky lang xa hoi. hieu van cam tuc ((va danh) OR (va dinh)) di cau theo*.