Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham loc » cham soc, chon loc, hau loc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
cham o » cham soc
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((v nang) or (va nang)) xa hoi. hieu ve ((cham loc) or (cham o)) va dan di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (va nang)) xa hoi. hieu ve ((cham loc) OR (cham o)) va dan di cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) or (va nang)) xa hoi. hieu ve ((cham loc) or (cham o)) va dan di cua tre*.