Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
van cam » van nam, van lam, van cau
vu sach » vu bach, su sach, vu khach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (thuoc sach)) ky sang ma hoi. hieu van cam ((xuc van) OR (luc van)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuoc sach)) ky sang ma hoi. hieu van cam ((xuc van) OR (luc van)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (thuoc sach)) ky sang ma hoi. hieu van cam ((xuc van) OR (luc van)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuoc sach)) ky sang ma hoi. hieu van cam ((xuc van) OR (luc van)) hanh vi cua te*.