Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, cach thuc
sach tham » sach nha
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
chat xuc » chat huu, cam xuc, chao xu
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di 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 thue) or (sach tham)) nang ma hoi. hieu va chat xuc ((va hanh) or (ban hanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thue) OR (sach tham)) nang ma hoi. hieu va chat xuc ((va hanh) OR (ban hanh)) vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thue) or (sach tham)) nang ma hoi. hieu va chat xuc ((va hanh) or (ban hanh)) vi cua viet*.