Perhaps you should try some spelling variations:
cham hoc » chat hoc, cham hoi, cho hoc
te sach » toc sach
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
hieu va » lieu va, hieu qua
ty nang » ky nang, ty hang, ly nang
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty nang) or (ty xang)) xa hoi. hieu va ((cham hoc) OR (cham soc)) va xanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty xang)) xa hoi. hieu va ((cham hoc) OR (cham soc)) va xanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ty xang)) xa hoi. hieu va ((cham hoc) OR (cham soc)) va xanh di cuu tre*".