Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
xa thanh » va thanh, ha thanh, ta thanh
ty nang » ky nang, ty xang, ty hang
cac tac » cac toc, cac bac, cac dac
nang o » nang co, nang ho, nang ro
tac xa » tuc xa, tac da
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: ((thuoc sach) or (thuat sach)) ty nang o hoi. hieu vien cac tac xa thanh ((te va) OR (tu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) ty nang o hoi. hieu vien cac tac xa thanh ((te va) OR (tu va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat sach)) ty nang o hoi. hieu vien cac tac xa thanh ((te va) OR (tu va)) triet".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) ty nang o hoi. hieu vien cac tac xa thanh ((te va) OR (tu va)) triet*.