Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, v nang, may nang

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 ((y nang) OR (ly nang)) xa hoi. hieu van cam ((duc va) or (thuc va)) hanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. hieu van cam ((duc va) OR (thuc va)) hanh lai chau tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) xa hoi. hieu van cam ((duc va) or (thuc va)) hanh lai chau tre*".