Perhaps you should try some spelling variations:
dinh thai » dinh thi, sinh thai, tinh thai
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
thai cau » thai cao, toan cau, thai van
van dinh » van minh, van dich, va dinh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, su sach, vu khach
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (vu sach)) ly nang mai hoi. hieu van cam thuc van dinh thai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu sach)) ly nang mai hoi. hieu van cam thuc van dinh thai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu sach)) ly nang mai hoi. hieu van cam thuc van dinh thai cau tren*.