Perhaps you should try some spelling variations:
tham nang » nham nang, tham lang, tham nhung
hieu cac » hieu luc, hieu van, vien cac
danh vai » danh sai, danh va, doanh van
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cua tre » cua te, cuu tre, cua triet

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 (te sach)) tham nang xa hoi. hieu ((hieu cac) or (hieu va)) nuoc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) tham nang xa hoi. hieu ((hieu cac) OR (hieu va)) nuoc va danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) tham nang xa hoi. hieu ((hieu cac) or (hieu va)) nuoc va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) tham nang xa hoi. hieu ((hieu cac) or (hieu va)) nuoc va danh vai cua tre*.