Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
kho tang » cao tang
tu sach » thu sach, te sach, tu cach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
ve cham » va cham, ve chat, vu cham
tang xa » trang xa, tang ma, lang xa
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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) or (su sach)) kho tang xa hoi. hieu ((ve cham) or (vien cac)) truc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) kho tang xa hoi. hieu ((ve cham) OR (vien cac)) truc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) kho tang xa hoi. hieu ((ve cham) or (vien cac)) truc va hanh di cua tre*.