Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va nang » van nang, da nang, cam nang
hieu ve » hieu va, hieu van
hau loc » huu loc, phau hoc
di cua » dai cua, doi cua, de cua
dan di » danh di, dan da, dan de
va dan » ca dan, va dao, va dau
cham o » cham soc
v nang » vu nang, van nang, voi nang
cua te » cua tu

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

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