Perhaps you should try some spelling variations:
danh khien » danh kien, doanh chien, dinh kien
toc sach » hoc sach, thuoc sach, nuoc sach
khien tu » dien tu
doc sach » hoc sach, nuoc sach, dac sac
thuc va » thuc dan, thuc day
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
x hoi » xa hoi, o hoi, x ho
tu te » tu tu, tu le

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (doc sach)) ky nang x hoi. hieu va pham ((thuc va) OR (thuc vat)) danh khien tu te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky nang x hoi. hieu va pham ((thuc va) OR (thuc vat)) danh khien tu te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ky nang x hoi. hieu va pham ((thuc va) OR (thuc vat)) danh khien tu te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ky nang x hoi. hieu va pham ((thuc va) OR (thuc vat)) danh khien tu te*.