Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cua tre » cua te, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo
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: vu sach ty ((lang xa) or (nang ma)) hoi. hieu qua cham soc va danh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((lang xa) OR (nang ma)) hoi. hieu qua cham soc va danh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((lang xa) or (nang ma)) hoi. hieu qua cham soc va danh vi ((cua tre) or (cuu tre))*.