Perhaps you should try some spelling variations:
thien van » thi van
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, duc va
cua tu » cua tuc, cua su, cua cu

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. thien van cac ((tuc va) or (tuc xa)) hanh vi ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. thien van cac ((tuc va) OR (tuc xa)) hanh vi ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. thien van cac ((tuc va) or (tuc xa)) hanh vi ((cua tre) or (cua tu))*.