Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
thuc dan » thuc hanh, hoc dan, thuc vat
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
dai hoi » dai hoc, dai hai, dai moi
qua cam » qua cham, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
vai cua » dai cua, hai cua, lai cua
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 dai hoi. hieu qua cam ((truc va) or (thuc dan)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang dai hoi. hieu qua cam ((truc va) OR (thuc dan)) hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach y nang dai hoi. hieu qua cam ((truc va) or (thuc dan)) hanh vai cua viet*.