Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dan tinh » doan tinh, dang tinh, dan trinh
thuc dan » thuc hanh, hoc dan, thuc vat
lang hoa » hang hoa, lang ha, nang hoa
tu sach » thu sach, te sach, tu cach
cua tre » cuu tre, cua triet, dua tren
hieu he » hieu ve, hiem he, hieu le
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
he nam » ha nam, nghe nam
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)) ky lang hoa hoc. hieu he nam thuc dan tinh dien ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang hoa hoc. hieu he nam thuc dan tinh dien ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky lang hoa hoc. hieu he nam thuc dan tinh dien ((cua tre) or (cua te))*.