Perhaps you should try some spelling variations:
thien van » thi van
thanh hoa » thanh pho
hieu van » hieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc
hoa cua » hoa chat, hoa xuat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa

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