Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
tu cach » tu cac
dan dan » dang dan, ban dan, dao dan
hieu ve » hieu va, hieu van
van hoc » van hoa
van hoe » van hoa, van hieu, van hien
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky dang ((van hoe) or (van hoc)). hieu ve cam thuc dan dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky dang ((van hoe) OR (van hoc)). hieu ve cam thuc dan dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky dang ((van hoe) or (van hoc)). hieu ve cam thuc dan dan vi cua tre*.