Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
van dau » van dao, phan dau
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
dai su » dai sua, dai so, dan su
o hoi » co hoi, o hoc, o hai

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 ((y nang) OR (v nang)) o hoi. thien van dau ((luc va) or (tuc va)) hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) o hoi. thien van dau ((luc va) OR (tuc va)) hanh dai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) o hoi. thien van dau ((luc va) or (tuc va)) hanh dai su triet*".