Perhaps you should try some spelling variations:
tinh thai » sinh thai, tinh toan, tinh chat
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
tinh tai » trinh tai, tinh hai, hinh tai
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang x hoi. hieu van cam thuc va ((tinh tai) OR (tinh thai)) cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu van cam thuc va ((tinh tai) OR (tinh thai)) cau tren".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu van cam thuc va ((tinh tai) OR (tinh thai)) cau tren*.