Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
cam thuc » am thuc, nam thuc, cam thu
vat hanh » vat thanh, van hanh, va hanh
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hoc cac » hoc cao
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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))) or (hoc cac)) ky nang mai hoi. hieu ve cam thuc vat hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (hoc cac)) ky nang mai hoi. hieu ve cam thuc vat hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (su sach))) or (hoc cac)) ky nang mai hoi. hieu ve cam thuc vat hanh vai cua te*.