Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
danh vai » danh sai, danh va, doanh van
cao suc » cao su, cao duc
vai cua » dai cua, hai cua, lai cua
nang xa » lang xa, nang ma, mang xa
va danh » va dinh, va dan, va hanh
qua cao » qua cac, qua ca, qua cai
suc va » duc va, tuc va, luc va
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 (doc sach)) tu ((nang xa) or (nang x)) hoi. hieu qua cao suc va danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) tu ((nang xa) OR (nang x)) hoi. hieu qua cao suc va danh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) tu ((nang xa) or (nang x)) hoi. hieu qua cao suc va danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) tu ((nang xa) or (nang x)) hoi. hieu qua cao suc va danh vai cua te*.