Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
dao hanh » dao thanh, dang hanh, ban hanh
day hanh » day nhanh, day thanh, day manh
nang cho » nang chon, ngang cho, nang cao
cam thuc » am thuc, nam thuc, cam thu
su sach » vu sach
so sach » so sanh, bo sach, co sach
cho hoc » co hoc, khoa hoc
van cam » van nam, van lam, van cau
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) v nang cho hoc. hieu van cam thuc ((day hanh) OR (dao hanh)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) v nang cho hoc. hieu van cam thuc ((day hanh) OR (dao hanh)) di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) v nang cho hoc. hieu van cam thuc ((day hanh) OR (dao hanh)) di cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) v nang cho hoc. hieu van cam thuc ((day hanh) OR (dao hanh)) di cua triet*.