Perhaps you should try some spelling variations:
tra triet » tra trinh, cua triet, va triet
hanh dieu » han dieu, hinh dieu, hoang dieu
dieu tra » dieu tri, kiem tra, dieu cua
thuc dan » hoc dan, thuc vat
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ((ve cam) or (ve cac)) ((thuc dan) or (thuc hanh)) hanh dieu tra triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ((ve cam) OR (ve cac)) ((thuc dan) OR (thuc hanh)) hanh dieu tra triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ((ve cam) or (ve cac)) ((thuc dan) or (thuc hanh)) hanh dieu tra triet*.