Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
dao dai » dat dai, dao dan, do dai
tao dai » thoi dai
huu tre » huu tri, cuu tre, huu them
luc ca » luc cao, luc cua, luc va
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 (thu sach)) ky nang x hoi. hieu va cac luc ca ((dao dai) OR (tao dai)) huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang x hoi. hieu va cac luc ca ((dao dai) OR (tao dai)) huu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky nang x hoi. hieu va cac luc ca ((dao dai) OR (tao dai)) huu tre*".