Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
may nang » may nong, ky nang, cam nang
nhan luc » nang luc
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, day nang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((((y nang) OR (may nang))) OR (v nang)) ma hoi. hieu va nhan luc va dan va cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((((y nang) OR (may nang))) or (v nang)) ma hoi. hieu va nhan luc va dan va cua viet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((((y nang) OR (may nang))) or (v nang)) ma hoi. hieu va nhan luc va dan va cua viet*.