Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
dan dai » dat dai, can dai, dan dat
bao luc » bao thuc
cao luc » cao duc, cao suc, cau luc
hieu va » lieu va, hieu qua
nang ro » nang co, nang ho, nang ra
ro hoi » co hoi, o hoi, mo hoi
v nang » va nang, vu nang, van nang
va dan » ca dan, va dao, va dau
cua te » cua tu

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 (thuoc sach)) v nang ro hoi. hieu va ((cao luc) or (bao luc)) va dan dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) v nang ro hoi. hieu va ((cao luc) OR (bao luc)) va dan dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) v nang ro hoi. hieu va ((cao luc) or (bao luc)) va dan dai cua te*".