Perhaps you should try some spelling variations:
su sach » vu sach
va hang » van hang, va nang, va lang
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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) or (so sach)) ky nang x hoi. hieu ve cam tuc va hang ((di cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang x hoi. hieu ve cam tuc va hang ((di cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang x hoi. hieu ve cam tuc va hang ((di cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang x hoi. hieu ve cam tuc va hang ((di cua) OR (de cua)) tre*.