Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hoc cac » hoc cao
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) or (hoc cac)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cham thuc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (hoc cac)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cham thuc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (hoc cac)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cham thuc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (hoc cac)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cham thuc va thanh vi cua tre*.