Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
bo sach » co sach, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
hang vi » hang va, hanh vi, hang di
va hang » van hang, va nang, va lang
vi cua » vai cua, di cua
cua te » cua tu
tuc va » thuc va, truc va, tuc xa

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) or (bo sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hang vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hang vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cam tuc va hang vi cua te*.