Perhaps you should try some spelling variations:
vao trien » va trien, bao thien, dao tien
thi hanh » thi thanh
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi nang
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((thi van) OR (thi hanh)) nam thuc dan ((hanh di) OR (hang di)) vao trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((thi van) or (thi hanh)) nam thuc dan ((hanh di) OR (hang di)) vao trien~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((thi van) or (thi hanh)) nam thuc dan ((hanh di) OR (hang di)) vao trien*.