Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
han tai » hang tai, van tai, toan tai
soc va » hoc va, loc va, doc va
thiet » thieu

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 ty nang xa hoi. hieu van cham soc va ((han tai) or (nhan tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cham soc va ((han tai) OR (nhan tai)) va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cham soc va ((han tai) or (nhan tai)) va thiet*.