Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
cu tren » tu tren, dua tren
vai cu » vai cua, van cu
cam o » cham o, cam lo, ca o
co o » co so, co _, so o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach y)) lang xa hoi. hieu va ((cam o) or (co o)) va dinh vai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) lang xa hoi. hieu va ((cam o) OR (co o)) va dinh vai cu tren.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) lang xa hoi. hieu va ((cam o) or (co o)) va dinh vai cu tren*.