Perhaps you should try some spelling variations:
ky trong » ly trong, ke trong, cay trong
trong xa » trong xay, trong ca, trong xu
hieu van » hieu va, thien van, lieu va
cua tren » dua tren, ca tren, cua tre
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nam luc » nang luc, nhan luc, nam thuc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky trong xa hoi. hieu van ((nam luc) OR (am thuc)) va hang di cua tren~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky trong xa hoi. hieu van ((nam luc) or (am thuc)) va hang di cua tren*.