Perhaps you should try some spelling variations:
thien van » thi van
dang xay » dang van, van xay
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
vai cuu » vai cua
soc van » hoc van, oc van, sac van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((dang xay) or (nang ma)) hoi. ((thien van) or (hieu va)) cham soc van hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((dang xay) OR (nang ma)) hoi. ((thien van) OR (hieu va)) cham soc van hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((dang xay) or (nang ma)) hoi. ((thien van) or (hieu va)) cham soc van hanh vai cuu tre*.