Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va nang » van nang, da nang, cam nang
va hang » van hang, va lang, va hanh
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de cua
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: ((tu sach) or (so sach)) ky nang x hoi. hieu ve cam tuc ((va hang) OR (va nang)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang x hoi. hieu ve cam tuc ((va hang) OR (va nang)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky nang x hoi. hieu ve cam tuc ((va hang) OR (va nang)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang x hoi. hieu ve cam tuc ((va hang) OR (va nang)) di cua tre*.