Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
han tai » hang tai, nhan tai, van tai
xa han » xa phan, va han, xa ban
cuc te » cua te, cuc thue, cuc tieu

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 (hoc sach)) ky nang ma hoa. hieu va cac tuc xa han tai cuc te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky nang ma hoa. hieu va cac tuc xa han tai cuc te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky nang ma hoa. hieu va cac tuc xa han tai cuc te*.