Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
nang tai » hang tai, tang tai, sang tai
doc sach » hoc sach, nuoc sach, dac sac
vay dong » van dong, va dong, day dong
cao nang » cao dang, cam nang, cao tang
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
do cao » o cao
cuc te » cua te, cuc thue, cuc tieu
cao do » cao dao, cau do, cap do
va cao » va cac, va co, va dao

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)) vay dong ((van hoi) or (van hoc)). lieu va cao do cao nang tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) vay dong ((van hoi) OR (van hoc)). lieu va cao do cao nang tai cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) vay dong ((van hoi) or (van hoc)). lieu va cao do cao nang tai cuc te*".