Perhaps you should try some spelling variations:
van trieu » tan trieu, van hieu, van tien
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
van tieu » van hieu, van tien, vay tieu
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
cam tu » cam thu, nam tu, dam tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach o lang xa hoi. hieu van ((cam tu) OR (nam thuc)) va hanh vi ((van trieu) OR (van tieu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach o lang xa hoi. hieu van ((cam tu) or (nam thuc)) va hanh vi ((van trieu) OR (van tieu))~".
• Adding a wildcard symbol may retrieve word variants: so sach o lang xa hoi. hieu van ((cam tu) or (nam thuc)) va hanh vi ((van trieu) OR (van tieu))*.