Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
trinh voi » trinh hoi, trinh vi, trinh boi
va trinh » van trinh, va tinh, lap trinh
dua tren » dung tren
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 (su sach)) ky nang x hoi. hieu va cam tuc va trinh voi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (su sach)) ky nang x hoi. hieu va cam tuc va trinh voi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (su sach)) ky nang x hoi. hieu va cam tuc va trinh voi ((dua tren) or (cua te))*.