Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
thai cua » than cua, tai cuc, tri cua
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, dam thuc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky lang xa hoi. hieu van ((cam tuc) or (nam thuc)) va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky lang xa hoi. hieu van ((cam tuc) OR (nam thuc)) va hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky lang xa hoi. hieu van ((cam tuc) or (nam thuc)) va hanh thai cua tre*.