Perhaps you should try some spelling variations:
sach tien » sach tren
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va

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

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