Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cham » va chat, va tham
va tinh » may tinh
vai va » mai va, dai va, hai va
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vu va, bi 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: so sach ty nang x hoi. lieu va cham soc ((va tinh) or (van hanh)) ((vi va) or (vai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. lieu va cham soc ((va tinh) OR (van hanh)) ((vi va) OR (vai va)) thiet.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. lieu va cham soc ((va tinh) or (van hanh)) ((vi va) or (vai va)) thiet*.