Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hieu va » lieu va, hieu qua
kinh vi » dinh vi, kinh ve, kenh vi
va kinh » va tinh, qua kinh
cam tuc » cam xuc, cam tu, nam thuc
vu sach » vu bach, su sach, vu khach
ky dang » ky nang, ky danh
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (thuoc sach)) ky dang cay phoi. hieu va cam tuc va kinh vi ((va thiet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuoc sach)) ky dang cay phoi. hieu va cam tuc va kinh vi ((va thiet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuoc sach)) ky dang cay phoi. hieu va cam tuc va kinh vi ((va thiet) or (cua vat))*.