Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
danh tai » doanh tai, dinh tai, hanh tai
doc sach » hoc sach, nuoc sach, dac sac
thuc va » thuc vat, thuc dan, thuc day
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
truc va » thuc vat, trung va
va cam » va cham, va cac, va cao
cuc te » cua te, cuc thue, cuc tieu

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 lang xa hoi. hieu va cam ((truc va) OR (thuc va)) danh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky lang xa hoi. hieu va cam ((truc va) OR (thuc va)) danh tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ky lang xa hoi. hieu va cam ((truc va) OR (thuc va)) danh tai cuc te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ky lang xa hoi. hieu va cam ((truc va) OR (thuc va)) danh tai cuc te*.