Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
dan thai » dang thai, dan thi, dan than
sach ky » sac ky, sach y, sach ty
van dat » van dao, van dau, dan dat
cua tuc » cua duc, cua tu, cua thuoc
va dan » ca dan, va dao, va dau
cua te » cua tu
x hoi » xa hoi, o hoi, 5 hoi
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) OR (x ho)). thien van dat nuoc va dan thai ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (x ho)). thien van dat nuoc va dan thai ((cua te) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (x ho)). thien van dat nuoc va dan thai ((cua te) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (x ho)). thien van dat nuoc va dan thai ((cua te) or (cua tuc))*.