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