Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
va doanh » van doanh, vay doanh, va danh
doanh va » doan va, doanh tai, doanh cua
cua viet » ca viet, hoa viet, cua dieu
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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)) ky nang ma hoi. lieu va cam xuc va doanh va ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky nang ma hoi. lieu va cam xuc va doanh va ((cua viet) OR (cua vat))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ky nang ma hoi. lieu va cam xuc va doanh va ((cua viet) OR (cua vat))*".