Perhaps you should try some spelling variations:
kham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, su triet, va triet
vat hanh » vat thanh, van hanh, va hanh
sach nay » sach hay, sach vay, sach nang
sach tay » xach tay, sach hay, sach tai
hanh va » hang va, hanh vi
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
lang xa » dang xay, lang van
lang ha » long ha
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tay) or (sach nay)) ((lang xa) OR (lang ha)) hoi. hieu vu kham thuc vat hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tay) OR (sach nay)) ((lang xa) OR (lang ha)) hoi. hieu vu kham thuc vat hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tay) or (sach nay)) ((lang xa) OR (lang ha)) hoi. hieu vu kham thuc vat hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach tay) or (sach nay)) ((lang xa) OR (lang ha)) hoi. hieu vu kham thuc vat hanh va cua triet*.