Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
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 v ((nang x) or (((mang may) or (nang cao)))) hoi. hieu ve cham truc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang x) OR (((mang may) OR (nang cao)))) hoi. hieu ve cham truc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang x) or (((mang may) or (nang cao)))) hoi. hieu ve cham truc van hanh vi cua tre*.