Perhaps you should try some spelling variations:
lang tai » lang thai, hang tai, tang tai
hanh tai » thanh tai, hang tai, han tai
tai khoa » da khoa, noi khoa
dau tren » dau tien, dat tren, dau tieng
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, te sach, tu cach

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 tai khoa. hieu ve pham duc va hanh tai ((cuu tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang tai khoa. hieu ve pham duc va hanh tai ((cuu tre) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky lang tai khoa. hieu ve pham duc va hanh tai ((cuu tre) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky lang tai khoa. hieu ve pham duc va hanh tai ((cuu tre) or (dau tren))*.