Perhaps you should try some spelling variations:
thien van » thi van
van thanh » ban thanh, van tuan
hoai thu » doi thu
hoai cuu » hoi cua, hoa cua, hai cua
so sach » so sanh, bo sach, co sach
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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 tu ((nang xa) or (nang ma)) hoi. thien van cam duc van thanh ((hoai cuu) OR (hoai thu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((nang xa) OR (nang ma)) hoi. thien van cam duc van thanh ((hoai cuu) OR (hoai thu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((nang xa) or (nang ma)) hoi. thien van cam duc van thanh ((hoai cuu) OR (hoai thu)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((nang xa) or (nang ma)) hoi. thien van cam duc van thanh ((hoai cuu) OR (hoai thu)) tre*.