Perhaps you should try some spelling variations:
lao dong » ha dong, van dong
chat xuc » chat huu, cam xuc, chao xu
so sach » so sanh, bo sach, co sach
ky dong » ly dong, ky dang, ky cong
hien tu » khien tu, dien tu
tu chat » tu phat, tu cham, du chat
xuc van » duc van, luc van, vuc van
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ky dong) or (lao dong)) hoa hoc. hien tu chat xuc van ban va ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky dong) OR (lao dong)) hoa hoc. hien tu chat xuc van ban va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ky dong) or (lao dong)) hoa hoc. hien tu chat xuc van ban va ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dong) or (lao dong)) hoa hoc. hien tu chat xuc van ban va ((cua tre) OR (cuu tre))*.