Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuc cao » thuoc cao, thuc co, thuc can
viec ban » viec lam, viec va, viec tai
viec dan » viec dang, viec dat, viec tang
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
cao dan » cao dang, cao danh, cac dan
cua tre » cua te, cuu tre, cua triet
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ty nang ((o hoi) or (o hai)). nhieu ((viec dan) or (viec ban)) thuc cao dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang ((o hoi) OR (o hai)). nhieu ((viec dan) OR (viec ban)) thuc cao dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang ((o hoi) or (o hai)). nhieu ((viec dan) or (viec ban)) thuc cao dan vi cua tre*.