Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » hieu qua
cam loc » cam lo
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
cuu tre » cua tre, cau tren, cau treo
y nang » ly nang, v nang, may nang
loc va » hoc va, luc va
du cuu » tu cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((y nang) or (ky nang)) xa hoi. ((hieu va) OR (lieu va)) cam loc va danh du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y nang) OR (ky nang)) xa hoi. ((hieu va) OR (lieu va)) cam loc va danh du cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y nang) or (ky nang)) xa hoi. ((hieu va) OR (lieu va)) cam loc va danh du cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y nang) or (ky nang)) xa hoi. ((hieu va) OR (lieu va)) cam loc va danh du cuu tre*.