Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hai cua » thai cua, dai cua, hoi cua
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
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 ky nang ma hoi. hieu ((ve cham) or (va cao)) ((thuc vat) or (thuc dan)) hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((ve cham) OR (va cao)) ((thuc vat) OR (thuc dan)) hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((ve cham) or (va cao)) ((thuc vat) or (thuc dan)) hanh hai cua te*.