Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc ban » duc van, dua ban, duc man
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) OR (sach tu)) nang xa hoi. hieu va pham ((duc ban) or (duc tan)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang xa hoi. hieu va pham ((duc ban) OR (duc tan)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach tu)) nang xa hoi. hieu va pham ((duc ban) or (duc tan)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach tu)) nang xa hoi. hieu va pham ((duc ban) or (duc tan)) thanh vi cua tre*.