Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hanh ve » hanh va, hanh kem
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
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: tu sach thi nang x hoi. ((hieu ve) or (hieu va)) nam thuc dan ((hanh ve) OR (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang x hoi. ((hieu ve) OR (hieu va)) nam thuc dan ((hanh ve) OR (hanh vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang x hoi. ((hieu ve) or (hieu va)) nam thuc dan ((hanh ve) OR (hanh vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang x hoi. ((hieu ve) or (hieu va)) nam thuc dan ((hanh ve) OR (hanh vi)) cua viet*.