Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
chua thiet » chuan thiet, cua thiet, thua thiet
duc thuan » duc tan, duc thang, duc phan
thuan anh » tuan anh, thuan thanh, thuat lanh
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
nang xa » nang x, lang xa, nang ma
vu chua » vua chua, vu cua, tu chua
y nang » ky nang, ly nang, v nang
anh vu » hanh vu, anh tu, anh va

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) OR (thuoc sach)) y nang xa hoi. hieu van pham duc thuan anh vu chua thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) y nang xa hoi. hieu van pham duc thuan anh vu chua thiet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) y nang xa hoi. hieu van pham duc thuan anh vu chua thiet*.