Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vat danh » va danh, van danh, luat danh
cau thuc » cau truc, cuu thuc, can thuc
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu va » lieu va, hieu qua
hoc cac » hoc cao
danh di » danh du, xanh di, danh dien
va cau » van cau, va cac, va dau
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (hoc cac)) ky ((nang xa) or (nang ma)) hoi. hieu va cau thuc vat danh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc cac)) ky ((nang xa) OR (nang ma)) hoi. hieu va cau thuc vat danh di su triet.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc cac)) ky ((nang xa) or (nang ma)) hoi. hieu va cau thuc vat danh di su triet*.