Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
dung doi » huong doi, dung tai, dung co
doi cua » dai cua, hoi cua, dong cua
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
qua cam » qua cac, qua ca, qua cai
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tuc va » truc va, tuc xa, duc va

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