Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac truc » cau truc, cac tru, cac trung
danh tai » doanh tai, hanh tai, anh tai
dinh tai » dinh toai, dinh tri, dinh thi
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
truc va » thuc va, thuc vat, trung va
quan su » quan cua

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