Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van dang » van dong, van dung, van nang
van vanh » van anh, van hanh, van manh
vanh dai » van dai, vanh tai, lanh dao
va nang » van nang, da nang, cam nang
xay hoi » xa hoi, tay hoi, cay phoi
qua cai » qua hai, qua cac, quan cau
vuc van » duc van, luc van, thuc van
qua ca » qua cac, qua cua, quan cau
cua tu » cua tuc, cua su, cua cu

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 ((va nang) or (van dang)) xay hoi. hieu ((qua cai) or (qua ca)) vuc van vanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((va nang) OR (van dang)) xay hoi. hieu ((qua cai) OR (qua ca)) vuc van vanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ((va nang) or (van dang)) xay hoi. hieu ((qua cai) or (qua ca)) vuc van vanh dai cua tu*.