Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
ly hang » ly quang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hang » van hang, va nang, va lang
hang vi » hanh vi, hang di, khang voi
va hoi » xa hoi, va hoc, va 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: ((te sach) OR (toc sach)) ly hang va hoi. hieu va cham duc va hang vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ly hang va hoi. hieu va cham duc va hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ly hang va hoi. hieu va cham duc va hang vi cua te*.