Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc cao » thuoc cao, thuc co, thuc can
viec dat » vien dai, vien da, viec lam
viec dan » viec dang, viec ban, viec tang
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, mang xa
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

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty ((nang xa) or (nang ma)) hoi. nhieu ((viec dan) or (viec dat)) thuc cao dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((nang xa) OR (nang ma)) hoi. nhieu ((viec dan) OR (viec dat)) thuc cao dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((nang xa) or (nang ma)) hoi. nhieu ((viec dan) or (viec dat)) thuc cao dan vi cua tre*.