Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
cua tren » dua tren, ca tren, cua tre
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
cam o » cham o, cam lo, tam o
ca o » co o, va 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 (ca o)) va dinh vai cua 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 (ca o)) va dinh vai cua tren.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) lang xa hoi. hieu va ((cam o) or (ca o)) va dinh vai cua tren*.