Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tai lang » tai cong, thi lan, tai san
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, van chat
phuc va » thuc va, chuc va, thuc vat
vi cua » vai cua, di cua
cua te » cua tu

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

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