Perhaps you should try some spelling variations:
tinh dinh » trinh dinh, tinh ninh, tinh binh
vu sach » vu bach, su sach, vu khach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
ban can » ban dan, ban hang, ban hanh
duc may » duc mau, duc man, duc manh
dinh cu » dinh cuu, dinh chuc, dinh chau
cu tre » cu tren, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tu lang xa hoi. hieu ((((ban can) or (van nam))) or (van lam)) duc may tinh dinh cu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu lang xa hoi. hieu ((((ban can) OR (van nam))) OR (van lam)) duc may tinh dinh cu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach tu lang xa hoi. hieu ((((ban can) or (van nam))) or (van lam)) duc may tinh dinh cu tre*.