Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
luu tre » luu tru, cuu tre, luy tre
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
vi luu » vi lua
te cac » tu cac, te cao, de cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te cac) OR (ve cac)) ky lang ha hoi. ((hieu quan) or (hieu qua)) tham nuoc van hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cac) OR (ve cac)) ky lang ha hoi. ((hieu quan) OR (hieu qua)) tham nuoc van hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) OR (ve cac)) ky lang ha hoi. ((hieu quan) or (hieu qua)) tham nuoc van hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((te cac) OR (ve cac)) ky lang ha hoi. ((hieu quan) or (hieu qua)) tham nuoc van hanh vi luu tre*.