Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
tru nang » tra nang, tri nang, truc nano
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tu lang » cu lang, tu lanh, xu lang
cua tre » cua te, cuu tre, cua triet
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: ((te sach) or (toc sach)) ((tu lang) or (tru nang)) xa hoi. hieu va cham duc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((tu lang) OR (tru nang)) xa hoi. hieu va cham duc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((tu lang) or (tru nang)) xa hoi. hieu va cham duc va danh di cua tre*.