Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thai cua » than cua, tri cua, dai cua
sach ky » sac ky, sach y, sach ty
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
ho hai » hoc hai, pho hai, cho hai
ve cac » va cac, vien cac

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 nang ho hai. hieu ve cac ((xuc van) or (duc van)) hanh ((thai cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ho hai. hieu ve cac ((xuc van) OR (duc van)) hanh ((thai cua) OR (tai cuc)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ho hai. hieu ve cac ((xuc van) or (duc van)) hanh ((thai cua) or (tai cuc)) tre*.