Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat cua » nhat cua, chat va, chat huu
cham cuu » cap cuu
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
cu tren » tu tren, dua tren
ma hoi » mai hoi, xa hoi, ma hoa
vi cu » vi su, vi xu, vi du

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 (toc sach)) ly nang ma hoi. lieu va ((cham cuu) or (chat cua)) va hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ly nang ma hoi. lieu va ((cham cuu) OR (chat cua)) va hanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ly nang ma hoi. lieu va ((cham cuu) or (chat cua)) va hanh vi cu tren*.