Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
hoi lang » hoa lang, hoi dan
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
cam thuc » am thuc, nam thuc, can thuc
sach hoi » sach doi, sach moi, cach thoi
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
cam thu » nam thu, cac thu, ca thu
lang xa » lang ha, dang xay, lang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoi lang xa hoi. hieu van ((cam thuc) OR (cam thu)) va hanh vi ((va triet) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi lang xa hoi. hieu van ((cam thuc) OR (cam thu)) va hanh vi ((va triet) OR (va tuyen))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi lang xa hoi. hieu van ((cam thuc) OR (cam thu)) va hanh vi ((va triet) or (va tuyen))*".