Perhaps you should try some spelling variations:
danh diem » danh dien, dinh diem, dac diem
diem cau » dieu can
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
qua lam » cua lam, qua la, qua lao
lam loc » lam duoc, lam ngoc
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
loc va » hoc va, luc va

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)) xa hoi. hieu qua lam loc va danh diem cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu qua lam loc va danh diem cau tren*.