Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
thu sach » thuat sach, thuoc sach, thu hoach
thi van » thi lan, thi hanh, thi nang
van dau » van dao, phan dau
tu sach » su sach, te sach, tu cach
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
dai su » dai sua, dai so, dan su
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: ((tu sach) OR (thu sach)) y nang x hoi. thi van dau ((xuc va) or (tuc va)) hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang x hoi. thi van dau ((xuc va) OR (tuc va)) hanh dai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang x hoi. thi van dau ((xuc va) or (tuc va)) hanh dai su triet*".