Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
chau tre » chau tho, cho tre, cau tra
hanh lai » hanh lam, hanh tai, thanh lap
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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