Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
vu cham » va cham, vu kham, tu cham
hai cua » thai cua, dai cua, hoi cua
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
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) OR (thu sach)) y nang ma hoi. hieu ((ve cam) or (vu cham)) xuc van hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ma hoi. hieu ((ve cam) OR (vu cham)) xuc van hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang ma hoi. hieu ((ve cam) or (vu cham)) xuc van hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang ma hoi. hieu ((ve cam) or (vu cham)) xuc van hanh hai cua tre*.