Perhaps you should try some spelling variations:
cau trung » cau truong, cac trung, cao trung
nang hoi » nang noi, nang hoc, nang ho
trung va » truong va, trang va, trung ha
tap cua » tap quan, tiep cua
lap cua » lai cua, lam cua, ap cua
va phan » van phan, va phat, va phap
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu vu » hieu ve, hieu su, dieu vu
hoi hoi » hoi hoc, hoc hoi, hoi doi
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua

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 hoi hoi. ((hieu vu) or (hieu va)) cau trung va phan ((lap cua) or (tap cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang hoi hoi. ((hieu vu) OR (hieu va)) cau trung va phan ((lap cua) OR (tap cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang hoi hoi. ((hieu vu) or (hieu va)) cau trung va phan ((lap cua) or (tap cua)) triet*.