Perhaps you should try some spelling variations:
van khang » van khanh, van thanh, van quang
toc sach » hoc sach, doc sach, thuoc sach
van nang » van quang, van ban, van dong
khang ki » khang vi, khang voi, khang kho
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
su viet » so viet
v nang » va nang, vu nang, voi nang
ve cam » ve cham, ve cac, va cam
ki su » ky su

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 (van nang)) mai hoi. hieu ve cam xuc van khang ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (van nang)) mai hoi. hieu ve cam xuc van khang ki su viet.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (van nang)) mai hoi. hieu ve cam xuc van khang ki su viet*.