Perhaps you should try some spelling variations:
toc sac » toc sach, toc san, hoc sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
dan vai » dan va, dan tai, dan vat
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ((ky lang) or (ky dang)) xa hoi. hieu va nam tu va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ((ky lang) OR (ky dang)) xa hoi. hieu va nam tu va dan vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ((ky lang) or (ky dang)) xa hoi. hieu va nam tu va dan vai cuu tre*.