Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tho nang » ho nang, cho nang, tho lang
phan tai » pham tai, nhan tai, phan thi
thi nang » thi cong, ki nang, thi hanh
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
va cham » va chat, va tham
luc va » tuc va, loc va
cua tu » cua tuc, cua su, cua cu
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: toc sach ((tho nang) or (thi nang)) x hoi. hieu va cham ((luc va) OR (duc va)) phan tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tho nang) OR (thi nang)) x hoi. hieu va cham ((luc va) OR (duc va)) phan tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((tho nang) or (thi nang)) x hoi. hieu va cham ((luc va) OR (duc va)) phan tai cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach ((tho nang) or (thi nang)) x hoi. hieu va cham ((luc va) OR (duc va)) phan tai cua tu*.