Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, hieu ve
va thanh » gia thanh, ban thanh, va tinh
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
van dau » van dao, phan dau
cam tu » cam thu, nam tu, dam tu
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: ((te sach) or (thuat sach)) ky nang x hoi. ((hieu van) OR (lieu va)) cam tu va thanh van dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky nang x hoi. ((hieu van) OR (lieu va)) cam tu va thanh van dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat sach)) ky nang x hoi. ((hieu van) OR (lieu va)) cam tu va thanh van dau tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang x hoi. ((hieu van) OR (lieu va)) cam tu va thanh van dau tren*.