Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
vi dau » vi dai, va dau, bi dau

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 (thu hoach)) ky dang xa hoi. ((hieu ve) or (lieu va)) cac xuc van hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky dang xa hoi. ((hieu ve) OR (lieu va)) cac xuc van hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky dang xa hoi. ((hieu ve) or (lieu va)) cac xuc van hanh vi dau tren*.