Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
cau xuc » cau luc, cau truc, chat xuc
va hanh » van hanh, va thanh, va danh
y mang » cay mang
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y mang may hoi. hieu va ((cau xuc) or (cam xuc)) va hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y mang may hoi. hieu va ((cau xuc) OR (cam xuc)) va hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: te sach y mang may hoi. hieu va ((cau xuc) or (cam xuc)) va hanh vi dau tren*.