Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
su triet » su viet, su tien, ve triet
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
ve pham » vi pham, ve phan, ve phat
hanh va » hang va, hanh vi
v pham » vi pham, d pham

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ty nang ma hoa. hieu ((ve pham) OR (v pham)) thuc dan hanh va su triet~".
• Adding a wildcard symbol may retrieve word variants: doc sach ty nang ma hoa. hieu ((ve pham) OR (v pham)) thuc dan hanh va su triet*.