Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
hien cac » thien cac, vien cac, hieu cac
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
vai cua » dai cua, hai cua, lai cua
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, va tinh
cua tu » cua tuc, cua su, cua cu
bao va » bao ve, tao va, ban va

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 ky ((nang xa) or (lang xa)) hoi. hieu ((hien cac) or (hieu van)) bao va dinh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu ((hien cac) OR (hieu van)) bao va dinh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. hieu ((hien cac) or (hieu van)) bao va dinh vai cua tu*.