Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
dang hai » dang khai, hang hai, dung hai
dan khai » dang khai, van khai, dang khoi
dan hai » doan hai, van hai, dai hai
sach ly » sach y, sach lo, sach ty
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
va nam » van nam, ha nam, va nay
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: su sach ly nang ma hoi. hieu va nam thuc va ((((dan hai) or (dan khai))) or (dang hai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu va nam thuc va ((((dan hai) OR (dan khai))) OR (dang hai)) su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu va nam thuc va ((((dan hai) or (dan khai))) or (dang hai)) su triet*.