Perhaps you should try some spelling variations:
nang doc » nang luc
doc hoi » duoc hoi, hoc hoi, doc hai
lam loc » lam duoc, lam ngoc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
loc va » hoc va, luc va
cua te » cua tu
va lam » van lam, va lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu cac) or (vu sach))) or (te sach)) ky nang doc hoi. hieu va lam loc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu cac) OR (vu sach))) OR (te sach)) ky nang doc hoi. hieu va lam loc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((((tu cac) or (vu sach))) or (te sach)) ky nang doc hoi. hieu va lam loc va hanh vi cua te*.