Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
te sach » toc sach
doan vi » doan va, don vi, doan thi
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, xac va
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
dan vi » don vi, dan va, gan vi

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 y nang xa hoi. hieu van chat ((xuc va) OR (luc va)) ((dan vi) or (doan vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu van chat ((xuc va) OR (luc va)) ((dan vi) OR (doan vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. hieu van chat ((xuc va) OR (luc va)) ((dan vi) or (doan vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu van chat ((xuc va) OR (luc va)) ((dan vi) or (doan vi)) cua tre*.