Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
soc va » hoc va, loc va, doc va

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 (sang ma)) hoi. hieu van cham soc va thanh vi ((cau tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (sang ma)) hoi. hieu van cham soc va thanh vi ((cau tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (sang ma)) hoi. hieu van cham soc va thanh vi ((cau tren) or (cua viet))*.