Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
quy trinh » qua trinh, quy dinh
su triet » su viet, su tien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
nang ho » nang hoc, nang co, tang ho
ho hoi » hoc hoi, hoa hoi, hoi hoi
nam tu » nam thu
van su » dan su

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)) tu nang ho hoi. hieu ve ((nam tu) or (nam thuc)) quy trinh van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu nang ho hoi. hieu ve ((nam tu) OR (nam thuc)) quy trinh van su triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) tu nang ho hoi. hieu ve ((nam tu) or (nam thuc)) quy trinh van su triet*.