Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
pham thuc » phap thuc, pham chuc, pham thu
day hanh » day nhanh, day thanh, dao hanh
nang doc » nang luc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
vi cua » vai cua, di cua
cua te » cua tu

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 noi) OR (nang doc)) hoi. hieu ve ((pham thuc) or (nham thuc)) day hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang noi) OR (nang doc)) hoi. hieu ve ((pham thuc) OR (nham thuc)) day hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang noi) OR (nang doc)) hoi. hieu ve ((pham thuc) or (nham thuc)) day hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang noi) OR (nang doc)) hoi. hieu ve ((pham thuc) or (nham thuc)) day hanh vi cua te*.