Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
lam loc » lam duoc, lam ngoc
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
tu sach » thu sach, su sach, te sach
v nang » va nang, van nang, voi nang
y nang » ky nang, ly nang, may nang
va lam » van lam, va lap
loc va » hoc va, luc va
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) or (((v nang) or (vu nang)))) xa hoi. hieu va lam loc va xanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (((v nang) OR (vu nang)))) xa hoi. hieu va lam loc va xanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (((v nang) or (vu nang)))) xa hoi. hieu va lam loc va xanh di cau tren*.