Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham tuc » nham thuc, pham thuc, tham thuc
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu su, dieu vu
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ky lang xa hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky lang xa hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky lang xa hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky lang xa hoi. ((hieu vu) OR (hieu ve)) cham tuc va hanh vi cua tre*.