Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
van hac » van hoc, van ha, van hai
sach ty » sach y, sach tu, sach thu
van cac » van cau, van bac, dan cac
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, dua tren
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 ty nang xa hoi. thien ((van cac) or (van hac)) tuc va tinh vi ((cua triet) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. thien ((van cac) OR (van hac)) tuc va tinh vi ((cua triet) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. thien ((van cac) or (van hac)) tuc va tinh vi ((cua triet) or (cua tre))*.