Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
lang ha » long ha
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
xuc tan » duc tan, xuc tac, xuc ban
tan anh » tuan anh, tran anh, toan anh
cua tuc » cua duc, cua tu, cua thuoc
anh ve » hanh ve, anh va, anh viet
va cam » va cham, va cac, va cao

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 ky ((lang ha) or (nang x)) hoi. hieu va cam xuc tan anh ve ((cua tuc) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang ha) OR (nang x)) hoi. hieu va cam xuc tan anh ve ((cua tuc) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang ha) or (nang x)) hoi. hieu va cam xuc tan anh ve ((cua tuc) or (cau tren))*.