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
nang co » nang cao, nang doc, nang noi
nang ho » nang hoc, tang ho, nang cao
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) OR (nang co)) 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) OR (nang co)) 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) OR (nang co)) 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) OR (nang co)) hoi. hieu vu ((cham truc) or (pham thuc)) van phan lap va trien*.