Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van phan » van phong, van thanh, luan phan
phan lap » phan dau
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ho » nang hoc, nang co, tang ho
hieu vu » hieu va, hieu ve, hieu su
ho hoi » hoc hoi, hoa hoi, hoi hoi
lap va » tap va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ho hoi. hieu vu ((cau truc) or (pham thuc)) van phan lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ho hoi. hieu vu ((cau truc) OR (pham thuc)) van phan lap va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. hieu vu ((cau truc) or (pham thuc)) van phan lap va triet*.