Perhaps you should try some spelling variations:
sau tien » dau tien, su tien, cau tieng
cam truc » cau truc, nam truc, lam truoc
loai sau » loai san, loai su, loai sach
dan loai » dang loai, phan loai, nhan loai
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dau

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