Perhaps you should try some spelling variations:
dat thanh » dao thanh, dat khanh, dang thanh
thanh vi » hanh vi, thanh va, thanh ve
thuc dat » thuc vat, thuc dan, thuc day
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
su sach » vu sach
vi cuu » vi luu, vinh cuu
ma hoi » mai hoi, xa hoi, ma hoa

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 (so sach)) ky nang ma hoi. hieu van nam thuc dat thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (so sach)) ky nang ma hoi. hieu van nam thuc dat thanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (so sach)) ky nang ma hoi. hieu van nam thuc dat thanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (su sach))) or (so sach)) ky nang ma hoi. hieu van nam thuc dat thanh vi cuu tre*.