Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
vi cua » vai cua, di cua
cua te » cua tu
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (thu sach)) ky lang xa hoi. ((hieu ve) or (hieu van)) hoc nuoc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu sach)) ky lang xa hoi. ((hieu ve) OR (hieu van)) hoc nuoc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu sach)) ky lang xa hoi. ((hieu ve) or (hieu van)) hoc nuoc va hanh vi cua te*.