Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham thuc » nham thuc, pham thuc, tham thuc
su triet » su viet, su tien, ve triet
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
vi su » va su, ve su, ki 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 (su sach))) or (thuoc sach)) ky lang xa hoi. hieu ve cham thuc dan hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (thuoc sach)) ky lang xa hoi. hieu ve cham thuc dan hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (thuoc sach)) ky lang xa hoi. hieu ve cham thuc dan hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (su sach))) or (thuoc sach)) ky lang xa hoi. hieu ve cham thuc dan hanh vi su triet*.