Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
su sach » so sach, vu sach
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
ve va » ve van, te va, le va
ke va » te va

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 ho. hieu ((ve cam) or (ve cac)) thuc dan hanh ((ve va) OR (ke va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. hieu ((ve cam) OR (ve cac)) thuc dan hanh ((ve va) OR (ke va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x ho. hieu ((ve cam) or (ve cac)) thuc dan hanh ((ve va) OR (ke va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. hieu ((ve cam) or (ve cac)) thuc dan hanh ((ve va) OR (ke va)) triet*.