Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh ve » hanh ve, thanh va, thanh vien
vu sach » vu bach, su sach, vu khach
hieu he » hieu ve, hiem he, hieu hien
hieu le » hieu ve, hieu ly, tieu le
na thuc » nam thuc, na thuoc, va thuc
ve cua » le cua, de cua, te cua
cua te » cua tu
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) or (v nang)) xa hoi. ((hieu le) OR (hieu he)) na thuc vat thanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (v nang)) xa hoi. ((hieu le) OR (hieu he)) na thuc vat thanh ve cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((y nang) or (v nang)) xa hoi. ((hieu le) OR (hieu he)) na thuc vat thanh ve cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) or (v nang)) xa hoi. ((hieu le) OR (hieu he)) na thuc vat thanh ve cua te*.