Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
thuc dan » thuc hanh, hoc dan
hang tai » hang va, dung tai
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
hanh xa » hanh va, hanh ma, hanh xu
hieu le » hieu ve, hieu he, hieu ly
tai cau » tai cac, tai cao
le nam » ly nam, he nam, le na

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi hanh xa hoi. hieu le nam ((thuc vat) or (thuc dan)) hang tai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi hanh xa hoi. hieu le nam ((thuc vat) OR (thuc dan)) hang tai cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach thi hanh xa hoi. hieu le nam ((thuc vat) or (thuc dan)) hang tai cau tren*.