Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hoc sach » hoc sinh, hoc cac, hoc anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
cao hoc » co hoc, cho hoc, chat hoc
va cam » va cham, va cac, va cao
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 (vu bach))) or (hoc sach)) ky nang cao hoc. hieu va cam thuc van hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (vu bach))) OR (hoc sach)) ky nang cao hoc. hieu va cam thuc van hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (vu bach))) or (hoc sach)) ky nang cao hoc. hieu va cam thuc van hanh vai cua te*.