Perhaps you should try some spelling variations:
thien van » thi van
ve triet » va trien, su 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
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
dai ve » dap ve, dau ve, dai va
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 ((xac va) or (tuc va)) hanh dai ve 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 ((xac va) OR (tuc va)) hanh dai ve 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 ((xac va) or (tuc va)) hanh dai ve triet*".