Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ke trang » ke toan
ke trong » le trong, ben trong, ro trong
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
tu cach » tu cac
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
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 cach) or (thuoc sach)) ((ke trong) OR (ke trang)) ha hoi. hieu ve cac duc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuoc sach)) ((ke trong) OR (ke trang)) ha hoi. hieu ve cac duc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuoc sach)) ((ke trong) OR (ke trang)) ha hoi. hieu ve cac duc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuoc sach)) ((ke trong) OR (ke trang)) ha hoi. hieu ve cac duc va hanh vi cua vat*.