Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
duc tien » duc thien, luc tieng, thuc tien
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, cac cuoc
duc tre » duoc tren
y sang » _ sang, duy sang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y sang ma hoa. hieu va ((cac xuc) or (chat xuc)) van hanh tai ((duc tre) OR (duc tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y sang ma hoa. hieu va ((cac xuc) OR (chat xuc)) van hanh tai ((duc tre) OR (duc tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y sang ma hoa. hieu va ((cac xuc) or (chat xuc)) van hanh tai ((duc tre) OR (duc tien))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y sang ma hoa. hieu va ((cac xuc) or (chat xuc)) van hanh tai ((duc tre) OR (duc tien))*.