Perhaps you should try some spelling variations:
thien van » thi van
trinh hoa » trinh do, trinh han
hieu van » hieu va, lieu va, hieu ve
tinh hoa » tinh hoc, minh hoa, thanh hoa
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, nam thuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

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

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