Perhaps you should try some spelling variations:
cao truc » cau truc, vao truc, cao thuoc
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
cua tre » cuu tre, cua triet, dua tren
so sanh » do sanh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
va cao » va cac, va co, va dao
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sanh)) ky lang xa hoi. hieu va cao truc va danh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky lang xa hoi. hieu va cao truc va danh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky lang xa hoi. hieu va cao truc va danh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky lang xa hoi. hieu va cao truc va danh vi ((cua tre) OR (cua te))*.