Perhaps you should try some spelling variations:
cham truc » nham thuc, pham thuc, nam truc
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ((ma hoi) or (ma hoa)). hieu van ((cham truc) OR (cau truc)) va xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((ma hoi) OR (ma hoa)). hieu van ((cham truc) OR (cau truc)) va xanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ((ma hoi) or (ma hoa)). hieu van ((cham truc) OR (cau truc)) va xanh di cua tre*".