Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 (((toc sach) or (doc sach)))) ky nang xa hoi. hieu ve pham thuc ban hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu ve pham thuc ban hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (((toc sach) or (doc sach)))) ky nang xa hoi. hieu ve pham thuc ban hanh vi cuu tre*.