Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
su triet » su viet, su tien, ve triet
danh ve » dinh ve, hanh ve, anh ve
thuc va » thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve pham » vi pham, v pham, ve phan
ve su » va su

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