Perhaps you should try some spelling variations:
hieu van » hieu va, lieu va, hieu ve
cam thuc » am thuc, nam thuc, cam thu
tinh hoa » trinh hoa, tinh hoc, minh hoa
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
hoa cua » hoa chat, hoa xuat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu van) or (((thien van) OR (thi van)))) cam thuc va tinh hoa cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. ((hieu van) OR (((thien van) OR (thi van)))) cam thuc va tinh hoa cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. ((hieu van) or (((thien van) OR (thi van)))) cam thuc va tinh hoa cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((hieu van) or (((thien van) OR (thi van)))) cam thuc va tinh hoa cua tre*.