Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
danh vai » danh sai, danh va, doanh van
dang xay » dang van, van xay
lang xa » lang ha, lang van
qua cao » qua cac, qua ca, qua cai
cao suc » cao su, cao duc
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
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 (thuoc sach)) tru ((lang xa) or (dang xay)) 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 (thuoc sach)) tru ((lang xa) OR (dang xay)) 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 (thuoc sach)) tru ((lang xa) or (dang xay)) hoi. hieu qua cao suc va danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) tru ((lang xa) or (dang xay)) hoi. hieu qua cao suc va danh vai cua te*.