Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
vay dong » van dong, va dong, day dong
cao nang » cao dang, cam nang, cao tang
nang tai » hang tai, tang tai, sang tai
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
cac do » cac don, cac doi, cac du
do cao » o cao
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)) vay dong ((van hoi) or (van hoc)). lieu va cac do cao nang tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) vay dong ((van hoi) OR (van hoc)). lieu va cac do cao nang tai cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) vay dong ((van hoi) or (van hoc)). lieu va cac do cao nang tai cuc te*".