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
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi nang
hanh di » hanh vi, hanh de, hang di
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) OR (te sach)) y nang xa hoi. ((thi van) OR (thi hanh)) nam thuc dan hanh di vao trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y nang xa hoi. ((thi van) or (thi hanh)) nam thuc dan hanh di vao trien~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y nang xa hoi. ((thi van) or (thi hanh)) nam thuc dan hanh di vao trien*.