Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, nam truc
pham thuc » phap thuc, pham chuc, nham thuc
va trien » va truyen, va thiet, va tuyen
phan lap » phan dau
van phan » van phong, van thanh, luan phan
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
hoa hoi » khoa hoi, hoa hoc, hoa doi
ty nang » ky nang, ty xang, ty hang
ho hoi » hoc hoi, hoi hoi, co 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) OR (hoa hoi)). hieu vu ((cham truc) or (pham thuc)) van phan lap va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ho hoi) OR (hoa hoi)). hieu vu ((cham truc) OR (pham thuc)) van phan lap va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((ho hoi) OR (hoa hoi)). hieu vu ((cham truc) or (pham thuc)) van phan lap va trien".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ho hoi) OR (hoa hoi)). hieu vu ((cham truc) or (pham thuc)) van phan lap va trien*.