Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
tham doc » than doc, tham do, tham nuoc
te sach » toc sach
ky lang » ky dang, ky tang, tay lang
va hanh » van hanh, va thanh, va danh
lua tre » cua tre, luy tre, dua tren
doc va » duoc va, hoc va, duc va
vi lua » vi luu

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 ((ky lang) OR (ky nang)) xa hoi. ((hieu quan) or (hieu qua)) tham doc va hanh vi lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky nang)) xa hoi. ((hieu quan) OR (hieu qua)) tham doc va hanh vi lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky nang)) xa hoi. ((hieu quan) or (hieu qua)) tham doc va hanh vi lua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky nang)) xa hoi. ((hieu quan) or (hieu qua)) tham doc va hanh vi lua tre*.