Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
thanh do » thanh de, thanh pho, thanh hoa
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
truc va » thuc va, trung va
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
do cua » doi cua, co cua, de cua

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) or (thu sach)) y nang xa hoi. hieu van cham ((truc va) OR (thuc vat)) thanh do cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van cham ((truc va) OR (thuc vat)) thanh do cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang xa hoi. hieu van cham ((truc va) OR (thuc vat)) thanh do cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang xa hoi. hieu van cham ((truc va) OR (thuc vat)) thanh do cua tre*.