Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) thieu nang mai hoi. hieu ((ve cam) or (va cham)) xuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thieu nang mai hoi. hieu ((ve cam) OR (va cham)) xuc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) thieu nang mai hoi. hieu ((ve cam) or (va cham)) xuc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) thieu nang mai hoi. hieu ((ve cam) or (va cham)) xuc va hanh vi cua viet*.