Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
tu hanh » du hanh, lu hanh, thuc hanh
tu hang » thu hang, tu hung, ty hang
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va dan » ca dan, va dao, va dap
va dau » va dao
di cua » dai cua, doi cua, de cua

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 ((tu hang) or (tu hanh)) cau hoi. hieu va cac xuc ((va dan) or (va dau)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu hang) OR (tu hanh)) cau hoi. hieu va cac xuc ((va dan) OR (va dau)) di cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu hang) or (tu hanh)) cau hoi. hieu va cac xuc ((va dan) or (va dau)) di cua triet*.