Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lai cua » dai cua, hai cua, thai cua
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 tu ((nang xa) OR (lang xa)) hoi. hieu ve cam duc van hanh ((lai cua) or (lai chau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang xa) OR (lang xa)) hoi. hieu ve cam duc van hanh ((lai cua) OR (lai chau)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((nang xa) OR (lang xa)) hoi. hieu ve cam duc van hanh ((lai cua) or (lai chau)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang xa) OR (lang xa)) hoi. hieu ve cam duc van hanh ((lai cua) or (lai chau)) triet*.