Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
loai sau » loai san, loai sach, loai nam
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va phan » van phan, va phat, va phap
loai su » lai su, loai tu, loai san
ve cam » ve cham, ve cac, va cam

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 ((ky lang) or (ky nang)) xa hoi. hieu ve cam truc va phan ((loai sau) OR (loai su)) tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu ve cam truc va phan ((loai sau) OR (loai su)) tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky nang)) xa hoi. hieu ve cam truc va phan ((loai sau) OR (loai su)) tien".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu ve cam truc va phan ((loai sau) OR (loai su)) tien*.