Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
vai cua » hai cua, lai cua, bai cua
hieu va » lieu va, hieu qua
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
co tuc » co thuc, co tu, co toc
tuc va » thuc va, truc va, tuc xa
va co » vo co

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