Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
doi cua » dai cua, hoi cua, dong cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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 ky ((nang xa) or (dang xay)) hoi. hieu ve cham soc ((va hanh) or (van hang)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (dang xay)) hoi. hieu ve cham soc ((va hanh) OR (van hang)) doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (dang xay)) hoi. hieu ve cham soc ((va hanh) or (van hang)) doi cua tre*.