Perhaps you should try some spelling variations:
kho tang » cao tang
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
cam loc » cam lo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
vi cua » vai cua, di cua

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 ((ky lang) or (kho tang)) xa hoi. hieu va cam loc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (kho tang)) xa hoi. hieu va cam loc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (kho tang)) xa hoi. hieu va cam loc va hanh vi cua tre*.