Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vii » hanh voi, hanh va, hanh noi
tai khoa » da khoa, noi khoa
lang tai » lang thai, hang tai, tang tai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
tu sach » thu sach, su sach, te sach
xuc va » tuc va, luc va, xac 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 ky lang tai khoa. hieu ve cham ((xuc va) or (duc va)) ((hanh vii) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang tai khoa. hieu ve cham ((xuc va) OR (duc va)) ((hanh vii) OR (hanh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang tai khoa. hieu ve cham ((xuc va) or (duc va)) ((hanh vii) or (hanh vi)) cau tren*.