Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va trien » va truyen, va thiet, va tuyen
danh vi » hanh vi, dinh vi, danh di
va cham » va chat, va tham
te sach » toc sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
xuc va » tuc va, luc va, xac va
vi va » vi van, vai va, vu va

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) or (thuoc sach)) ky lang xa hoi. hieu va cham ((xuc va) OR (duc va)) danh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky lang xa hoi. hieu va cham ((xuc va) OR (duc va)) danh vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky lang xa hoi. hieu va cham ((xuc va) OR (duc va)) danh vi va trien".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky lang xa hoi. hieu va cham ((xuc va) OR (duc va)) danh vi va trien*.