Perhaps you should try some spelling variations:
kham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
toc sach » hoc sach, doc sach, thuoc sach
phan lap » phan dau
va phan » van phan, va phat, va phap
thuc va » thuc vat, thuc dan, thuc day
hieu vu » hieu va, hieu ve, hieu su
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
vu kham » vu khanh
ho hoi » hoc hoi, hoa hoi, hoi hoi

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) OR (toc sach)) ty nang ho hoi. hieu vu kham thuc va phan lap ((cua triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang ho hoi. hieu vu kham thuc va phan lap ((cua triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang ho hoi. hieu vu kham thuc va phan lap ((cua triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang ho hoi. hieu vu kham thuc va phan lap ((cua triet) or (ve triet))*.