Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, thanh san
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
cam lo » nam lo, cam ly, cam o
lo gia » ho gia, co gia, do gia

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) or (ky nang)) ma hoi. hieu va cam lo gia ((thanh tai) OR (doanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) ma hoi. hieu va cam lo gia ((thanh tai) OR (doanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ky nang)) ma hoi. hieu va cam lo gia ((thanh tai) OR (doanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ky nang)) ma hoi. hieu va cam lo gia ((thanh tai) OR (doanh tai)) cua tre*.