Perhaps you should try some spelling variations:
toan hanh » toan thanh, toan anh, tran hanh
thu sach » tu sach, thuat sach, thuoc sach
duc toan » duc tan, duc ton, duc hoan
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va pham » van pham, va phat, va phap
doi cua » dai cua, hoi cua
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang x ho. lieu va pham duc toan hanh ((di cua) or (doi cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x ho. lieu va pham duc toan hanh ((di cua) OR (doi cua)) vat.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x ho. lieu va pham duc toan hanh ((di cua) or (doi cua)) vat*.