Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
cua viet » ca viet, hoa viet, cua vat
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
danh di » danh du, xanh di, danh dien
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
di cua » dai cua, doi cua, de cua

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)) ky nang mai hoi. hieu va cam ((xuc va) OR (duc va)) danh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang mai hoi. hieu va cam ((xuc va) OR (duc va)) danh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang mai hoi. hieu va cam ((xuc va) OR (duc va)) danh di cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang mai hoi. hieu va cam ((xuc va) OR (duc va)) danh di cua viet*.