Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tham soc » cham soc, tham nuoc, ham so
thai son » thai den, thai do, thai o
thai hoc » dai hoc, bai hoc, hoi hoc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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