Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
dung sai » dung tai, dung va, dung dat
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
ha dung » hai dung, kha dung, nha dung
sai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam

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 (tu cac))) or (thuoc sach)) ky nang ma hoi. hieu he nam thu ha dung sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu cach) OR (tu cac))) OR (thuoc sach)) ky nang ma hoi. hieu he nam thu ha dung sai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu cach) OR (tu cac))) or (thuoc sach)) ky nang ma hoi. hieu he nam thu ha dung sai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((((tu cach) OR (tu cac))) or (thuoc sach)) ky nang ma hoi. hieu he nam thu ha dung sai cua triet*.